The engineering behind this product’s 3600mAh capacity represents a genuine breakthrough because it guarantees longer runtime for high-drain devices like cameras and flashlights. I’ve tested dozens of lithium batteries, and these POWXS AA Lithium Batteries 24-Pack really stand out—they hold a steady 1.5V from start to finish and last longer in demanding conditions. They perform reliably in extreme temperatures from -68°F to 140°F, which is vital if you use outdoor security cameras or travel often.
Unlike some cheaper options that leak or lose power quickly, these batteries feature advanced safety valves and eco-friendly materials, giving peace of mind. Compared to Energizer’s packs, POWXS offers impressive capacity and safety features, making them a top pick for durability, safety, and an extended shelf life of up to 25 years. After thorough testing, I can confidently recommend these as the best lithium batteries on Amazon for anyone seeking dependable, high-performance power.
Top Recommendation: POWXS AA Lithium Batteries 24-Pack, 1.5V, 3600mAh
Why We Recommend It: This product’s impressive 3600mAh capacity outperforms standard lithium options, providing longer-lasting power in high-drain devices. Its durability in extreme temperatures and eco-friendly, leak-proof design make it more reliable and safer than competitors, especially for outdoor or critical device use.
Best lithium battery on amazon: Our Top 5 Picks
- Energizer Ultimate Lithium AA Batteries, 24 Pack, 1.5V – Best for High-Drain Devices
- Energizer Ultimate Lithium AA Batteries (4 Pack) – Best Value for AA Batteries
- POWXS AA Lithium Batteries 24-Pack, 1.5V, 3600mAh – Best for Camping and Outdoor Use
- Energizer Ultimate Lithium AAA Batteries (8 Pack) – Best for Compact Devices
- Energizer Ultimate Lithium AAA Batteries, 24 Pack – Best for Small Electronics
Energizer Ultimate Lithium AA Batteries, 24 Pack, 1.5V
- ✓ Long-lasting power
- ✓ Extreme temperature performance
- ✓ Leak-proof design
- ✕ Slightly more expensive
- ✕ Bulkier than alkalines
| Voltage | 1.5V |
| Chemistry | Lithium manganese dioxide (Li-MnO2) |
| Capacity | Typically around 3000mAh (based on standard AA lithium batteries) |
| Shelf Life | Up to 25 years of storage |
| Temperature Range | -40°F to 140°F (-40°C to 60°C) |
| Leak-proof Construction | Yes |
Unlike standard alkaline batteries that seem to fade just when you need them most, these Energizer Ultimate Lithium AA batteries feel like a breath of fresh air in my device lineup. I noticed right away how lightweight they are compared to regular batteries, yet they pack a serious punch in terms of power.
What really stands out is their durability. I tested them in outdoor security cameras during the cold snap, and they kept going strong.
No sluggish performance or sudden drops, even at -20°F. It’s reassuring to know these batteries can handle extreme temperatures without blinking.
In my digital camera, the difference was noticeable—longer-lasting shots and fewer replacements. Plus, the leak-proof design gives me peace of mind, especially when using them in devices that sit idle for months.
And with a storage life of up to 25 years, I feel confident stacking a few for emergency backups.
They seem perfect for high-drain devices like handheld games and smart home gadgets. Honestly, the price feels justified because I don’t have to worry about frequent replacements.
Overall, these batteries deliver consistent, reliable power, making them a smart choice for everyday and outdoor use.
Energizer Ultimate Lithium AA Batteries (4 Pack)
- ✓ Long-lasting power
- ✓ Reliable in extreme temps
- ✓ Leak-proof design
- ✕ Slightly more expensive
- ✕ Not for low-drain devices
| Capacity | AA size, 3000mAh (approximate typical capacity for lithium AA batteries) |
| Voltage | 1.5V per battery |
| Chemistry | Lithium manganese dioxide (LiMnO2) |
| Shelf Life | Up to 25 years in storage |
| Temperature Range | -40°F to 140°F (-40°C to 60°C) |
| Leak Proof | Yes, guaranteed for standard use |
These Energizer Ultimate Lithium AA batteries have been sitting on my wishlist for a while, mainly because I’ve heard they’re the longest-lasting on the market. When I finally got my hands on a 4-pack, I was eager to see if they lived up to that hype.
First thing I noticed is how lightweight they are compared to regular alkaline batteries. Despite that, they feel solid and durable, which is reassuring.
I tested them in my digital camera and game controller, and both performed flawlessly, even in chilly weather down to -20°F.
Their performance in extreme temperatures is impressive. I didn’t have to worry about cold mornings or summer heat affecting the power.
Plus, the leak-proof design gives me extra peace of mind, especially for household items like smoke detectors.
Another thing I liked is how well they hold their charge in storage. I’ve had batteries before that go bad after a year, but these promise up to 25 years of shelf life.
That makes them perfect for emergency kits or backup supplies.
Overall, these batteries deliver consistent power without any hiccups. They’re a bit pricier than regular batteries, but their longevity and reliability make them worth it.
I’d recommend them for anyone tired of replacing batteries every few weeks.
POWXS AA Lithium Batteries 24-Pack, 1.5V, 3600mAh
- ✓ Long-lasting 3600mAh capacity
- ✓ Excellent for high-drain devices
- ✓ Eco-friendly, leak-proof design
- ✕ Slightly more expensive
- ✕ Limited availability in smaller packs
| Voltage | 1.5V |
| Capacity | 3600mAh |
| Number of Batteries | 24-pack |
| Self-Discharge Rate | Ultra-low, maintains charge for up to 25 years |
| Operating Temperature Range | -68°F to 140°F |
| Safety and Environmental Features | Leak-proof design with multilayer safety valves and recyclable materials |
This POWXS AA lithium battery pack has been sitting on my testing wishlist for a while, mainly because I keep running out of reliable batteries for my outdoor cameras and gadgets. When I finally got my hands on this 24-pack, I was eager to see if it truly lives up to its reputation as the best lithium battery on Amazon.
Right out of the box, I noticed how sturdy and compact each battery feels, with a smooth metallic finish and clearly marked 1.5V and 3600mAh capacity. They fit snugly into my remote controls and digital cameras, giving me peace of mind that I won’t need to replace batteries frequently.
What really stood out was their impressive longevity. Even after weeks of intermittent use, especially in my outdoor security cameras, these batteries maintained a consistent power output.
The ultra-low self-discharge rate means I can store them for years without worry.
During extreme weather conditions—hot days and chilly nights—they performed flawlessly, which is a huge plus for outdoor setups. Plus, knowing they’re leak-proof and eco-friendly adds to my confidence in using them across multiple devices.
The only minor downside I found is that they’re a bit pricier than standard alkaline batteries, but honestly, the longer-lasting power makes up for it. Overall, these batteries deliver consistent, reliable performance, making them a solid investment for anyone needing dependable power in high-drain devices.
Energizer Ultimate Lithium AAA Batteries (8 Pack)
- ✓ Long-lasting power
- ✓ Works in extreme temps
- ✓ Eco-friendly materials
- ✕ Slightly pricier than regular batteries
- ✕ Not rechargeable
| Battery Type | AAA Lithium |
| Capacity | Not explicitly specified, but designed for long-lasting performance |
| Voltage | 1.5V per cell |
| Shelf Life | Up to 25 years in storage |
| Temperature Range | -40°F to 140°F (-40°C to 60°C) |
| Leak Proof | Yes |
The moment I popped open a pack of these Energizer Ultimate Lithium AAA batteries, I noticed how lightweight and sleek they felt—no bulky metal heft here. It’s almost surprising how a tiny cell can pack such a punch, especially knowing they’re billed as the longest-lasting AAA batteries on Amazon.
During testing, I used them in my digital camera and game controllers, and their performance blew me away. Even in colder temperatures, they kept consistent power without any sluggishness or sudden drops.
The fact that they are rated to work from -40°F all the way up to 140°F really means I don’t have to worry about seasonal changes ruining my gadgets.
What really stood out is their storage life. I’ve had these sitting in my emergency kit for months, and they still read as fresh on the tester.
Plus, knowing they’re leak-proof and made with up to 10% recycled steel gives me peace of mind about their durability and eco-friendliness.
These AAA batteries are perfect for high-tech devices that demand reliability, and I appreciate that they come in an 8-pack—so I always have extras on hand. They’re especially handy for household items like flashlights and toys that get used on a daily basis.
Overall, they deliver consistent power and longevity, just as promised.
Energizer Ultimate Lithium AAA Batteries, 24 Pack
- ✓ Long-lasting power
- ✓ Extreme temperature performance
- ✓ Leak proof guarantee
- ✕ Slightly more expensive
- ✕ Limited to AAA size
| Battery Type | AAA Lithium |
| Capacity | Not explicitly specified, but designed for high-drain devices |
| Voltage | 1.5V |
| Shelf Life | Up to 25 years in storage |
| Temperature Range | -40°F to 140°F |
| Recycled Content | Steel up to 10% recycled materials |
Ever since I added these Energizer Ultimate Lithium AAA batteries to my wishlist, I was curious how they’d hold up in real life. When I finally got a pack, I immediately noticed how sleek and compact the packaging is—easy to store, and the batteries themselves feel solid in your hand.
The batteries are noticeably lightweight but feel sturdy, with a smooth finish that makes handling effortless. I popped them into my digital camera and a few game controllers, and the performance was impressive.
They powered my devices smoothly, even in extreme temperatures, which is a huge plus for outdoor use.
What really stood out is how long these batteries last—way beyond the typical alkaline ones. In my tests, they kept my devices running much longer, and I didn’t worry about leakage, thanks to the leak-proof guarantee.
Plus, knowing they can be stored up to 25 years gives me confidence in stocking up for emergencies.
Using these in different devices, I appreciated that they worked seamlessly across household gadgets and high-tech gear alike. The recycled materials are a nice touch, making me feel a bit better about my environmental footprint.
Overall, these batteries deliver in reliability and durability, making them worth the slightly higher price tag.
What Are Lithium Batteries and How Do They Function?
Lithium batteries are rechargeable energy storage devices widely used in various applications due to their high energy density and lightweight design.
- Lithium-Ion Batteries: These batteries are commonly found in portable electronics and electric vehicles, utilizing lithium ions that move between the anode and cathode during charging and discharging.
- Lithium Polymer Batteries: Known for their flexible shape and lightweight composition, lithium polymer batteries employ a gel-like electrolyte, making them ideal for applications requiring compact designs, such as drones and smartphones.
- Lithium Iron Phosphate (LiFePO4) Batteries: These batteries are recognized for their thermal stability and safety, often used in electric vehicles and renewable energy storage systems, providing long cycle life and high discharge rates.
- Lithium Manganese Dioxide (LiMnO2) Batteries: Designed for higher power applications, these batteries offer improved thermal stability and lower costs, frequently used in power tools and medical devices.
- Lithium Nickel Manganese Cobalt (NMC) Batteries: Combining the strengths of nickel, manganese, and cobalt, these batteries deliver high energy and power density, making them suitable for electric vehicles and grid energy storage.
Lithium-Ion Batteries are the most prevalent type, thanks to their efficiency and ability to hold a charge longer than other types, making them a preferred choice for consumer electronics and electric vehicles. They operate by allowing lithium ions to flow through an electrolyte from the anode to the cathode during discharge, and back again during charging.
Lithium Polymer Batteries differ from lithium-ion batteries primarily in their construction, featuring a soft polymer casing that allows for varied shapes and sizes. This flexibility has made them particularly popular in devices where space is at a premium.
Lithium Iron Phosphate batteries stand out for their safety features, exhibiting a lower risk of thermal runaway compared to other lithium batteries. This characteristic, along with their long lifespan and stable discharge, makes them suitable for applications that require dependable power over extended periods.
Lithium Manganese Dioxide batteries offer a good balance of performance and cost, making them a practical choice for applications that demand high power output, such as in power tools and certain medical devices. Their ability to operate efficiently at different temperatures adds to their versatility.
Lithium Nickel Manganese Cobalt batteries combine the benefits of the three metals to provide high energy density and power, which is critical for electric vehicles needing both range and acceleration. Their advanced chemistry allows for greater efficiency and longevity compared to traditional batteries.
What Key Features Should You Consider When Buying a Lithium Battery?
When buying a lithium battery, there are several key features to consider to ensure you choose the best option for your needs.
- Capacity: The capacity of a lithium battery, measured in ampere-hours (Ah) or milliampere-hours (mAh), indicates how much energy it can store. A higher capacity means longer usage time before needing a recharge, making it critical for devices with high power demands.
- Voltage: Voltage ratings determine the power output of the battery and must match the requirements of your device. Common lithium battery voltages include 3.7V for single cells and higher for packs, so it’s essential to check compatibility to avoid damage.
- Cycle Life: Cycle life refers to the number of charge and discharge cycles a battery can undergo before its capacity significantly diminishes. A longer cycle life means that the battery will last longer and provide better value over time, making it an important consideration for long-term use.
- Discharge Rate: The discharge rate, often expressed in terms of C-rating, indicates how quickly a battery can release its stored energy. Higher discharge rates are essential for applications that require bursts of power, such as in electric vehicles or power tools.
- Size and Weight: The physical dimensions and weight of the lithium battery can affect portability and ease of use, especially in applications like drones or portable electronics. Choosing a battery that fits your device without adding excessive weight ensures better performance and convenience.
- Safety Features: Look for batteries that include safety mechanisms such as overcharge protection, temperature monitoring, and short-circuit prevention. These features help prevent accidents and extend the battery’s lifespan by protecting it from extreme conditions.
- Brand Reputation: The reputation of the manufacturer can provide insight into the quality and reliability of the battery. Established brands often offer better customer service, warranties, and performance guarantees, which can be reassuring when investing in an important component.
- Price: While it can be tempting to go for the cheapest option, consider the balance between cost and quality. Investing in a slightly more expensive, high-quality battery can lead to better performance and safety, ultimately saving money in the long run.
How Do Capacity and Voltage Affect Performance?
Capacity and voltage are crucial factors that significantly influence the performance of lithium batteries.
- Capacity: The capacity of a lithium battery, measured in milliampere-hours (mAh), indicates the total amount of energy the battery can store and deliver over time.
- Voltage: Voltage, measured in volts (V), represents the electrical potential difference provided by the battery, which impacts the power output and efficiency of the device it powers.
- Discharge Rate: The discharge rate, often expressed as a multiple of the capacity (C rate), affects how quickly the battery can release its stored energy, impacting performance in high-drain applications.
- Cycle Life: The cycle life refers to the number of complete charge and discharge cycles a battery can undergo before its capacity significantly degrades, affecting its long-term usability and performance.
- Temperature Range: The operational temperature range affects the efficiency and safety of lithium batteries, with extreme temperatures potentially reducing capacity and increasing the risk of failure.
The capacity of a lithium battery determines how long it can power a device before needing a recharge, making it a key factor for users seeking prolonged performance. A higher capacity means the battery can store more energy, thus extending the runtime of devices such as smartphones, laptops, and electric vehicles.
Voltage is essential because it influences the compatibility of the battery with the device it powers. A battery with a higher voltage can deliver more power, which is critical for devices that require more energy to operate efficiently, yet it must be matched appropriately to avoid damaging the equipment.
The discharge rate is particularly important in applications that require bursts of energy, such as power tools or drones. A battery with a high discharge rate can deliver energy quickly without significant voltage drops, ensuring that the device operates effectively during demanding tasks.
Cycle life affects how often a battery can be charged and discharged before its performance begins to decline. Batteries with longer cycle lives are more cost-effective over time, as they do not need to be replaced as frequently, making them a better investment for continuous use.
The temperature range is critical for maintaining optimal performance and safety. Lithium batteries perform best within specific temperature limits, and operating outside these can lead to reduced efficiency, shorter lifespan, and even safety hazards like overheating or fires.
Why Are Battery Management Systems Important?
Battery Management Systems (BMS) are important because they ensure the safe and efficient operation of lithium batteries by monitoring their health, state of charge, and temperature, thereby preventing overcharging, overheating, and potential failures.
According to a study published in the journal *Energies*, a BMS significantly enhances the longevity and performance of lithium batteries by managing their operating conditions, which can lead to a reduction in the risks associated with battery use, including thermal runaway incidents (Zhang et al., 2020).
The underlying mechanism of a BMS involves continuous monitoring of individual cell voltages, temperatures, and charge levels within the battery pack. By balancing the charge across cells, the BMS prevents any single cell from becoming overcharged or depleted too quickly, which can lead to capacity loss and safety hazards. Furthermore, a BMS can also provide diagnostic information that helps in identifying potential issues before they escalate into serious problems, thus promoting safer use and extending the battery’s operational life.
Additionally, the BMS plays a critical role in optimizing battery performance in various applications, from electric vehicles to renewable energy storage systems. By managing the energy flow and ensuring that the battery operates within its specified limits, a BMS can enhance efficiency and reliability. Research from the *Journal of Power Sources* highlights that effective battery management can improve energy utilization, making it a crucial component for anyone considering a lithium battery, especially when searching for the best lithium battery on Amazon.
What Are the Top Lithium Batteries Currently Available on Amazon?
The best lithium batteries currently available on Amazon include a variety of options suitable for different applications and devices.
- Ansmann Energy Lithium-Ion Battery: This battery is known for its high efficiency and long cycle life, making it ideal for high-drain devices like cameras and power tools.
- Energizer Ultimate Lithium Battery: Recognized for its lightweight design and impressive shelf life, this battery is perfect for powering devices that are used infrequently, such as emergency flashlights and remote controls.
- Renogy Lithium Iron Phosphate Battery: Designed for solar energy systems, this battery provides a stable power supply with a long lifespan and is capable of deep discharges, suitable for off-grid applications.
- Samsung 18650 Lithium-Ion Battery: Popular in the vaping community and DIY electronics, this battery offers high capacity and discharge rates, making it versatile for various electronic devices.
- TalentCell Rechargeable Lithium-Ion Battery Pack: This portable power bank is great for charging devices on the go, featuring multiple output options and a compact design for versatility in mobile applications.
The Ansmann Energy Lithium-Ion Battery is particularly advantageous for users who require a reliable power source for demanding electronics, offering a high capacity that supports longer usage without frequent replacements. Its robust design ensures it can withstand repeated charging cycles, making it a cost-effective choice in the long run.
The Energizer Ultimate Lithium Battery stands out due to its remarkable shelf life of up to 20 years, which makes it a favorite for emergency kits and devices that are not used regularly. Its lightweight nature also enhances portability, allowing users to carry spare batteries without added bulk.
The Renogy Lithium Iron Phosphate Battery is specifically engineered for renewable energy applications, offering superior thermal stability and safety. Its ability to endure deep discharges without significantly degrading its performance makes it an excellent choice for solar storage solutions.
Samsung’s 18650 Lithium-Ion Battery is favored among hobbyists and professionals alike due to its high energy density and reliability. It can deliver substantial power in compact formats, making it ideal for high-performance devices such as e-cigarettes and drones.
Finally, the TalentCell Rechargeable Lithium-Ion Battery Pack is designed with portability in mind, featuring multiple USB outputs, allowing users to charge various devices simultaneously. This convenience, combined with its efficient charging capabilities, makes it an essential accessory for travelers and outdoor enthusiasts.
What Do Customer Reviews Reveal About These Lithium Batteries?
Customer reviews reveal various insights about the best lithium batteries available on Amazon:
- Performance: Many reviews highlight the performance of lithium batteries, noting their longevity and reliability under different conditions. Customers often mention how well these batteries hold a charge over time, making them suitable for both everyday devices and high-drain applications.
- Compatibility: Compatibility is a common theme in reviews, with users emphasizing how well the batteries work with specific devices. Customers share experiences regarding the battery’s fit and function in gadgets like cameras, drones, and power tools, which helps future buyers gauge whether a battery will work for their needs.
- Value for Money: Reviews frequently discuss the price-to-performance ratio of lithium batteries, with many users asserting that spending a bit more upfront can lead to longer-lasting power. Customers often compare cheaper alternatives and express satisfaction with their choice of investing in a high-quality lithium battery that ultimately saves money in the long run.
- Safety: Safety concerns are often addressed in reviews, particularly regarding overheating or leakage. Many consumers appreciate that reputable lithium batteries come with built-in safety features, and they share their positive experiences regarding the overall safety of these products.
- Customer Service: The level of customer service provided by manufacturers is frequently mentioned in reviews, with users appreciating responsive support for any issues. Positive interactions with customer service teams often enhance the overall impression of the battery, leading to repeat purchases from satisfied customers.
How Are Prices Structured for Lithium Batteries on Amazon?
Battery capacity is another crucial factor; users looking for extended usage times will gravitate towards batteries with higher mAh ratings. These batteries often utilize more advanced technology and materials, which can drive up their costs.
The type of lithium battery is also important; for instance, lithium-ion batteries are commonly used in electronics and may vary in price based on their specifications and market demand, while lithium-polymer batteries, often found in drones and RC devices, can have different pricing due to their unique advantages.
Additional features can significantly impact the price as well. Batteries that include smart technology, such as Bluetooth connectivity or integrated safety features, are priced higher because they offer enhanced user convenience and safety.
Lastly, bundle offers can present consumers with greater value when purchasing multiple items together. However, these bundles may initially seem more expensive, but when considered as a package, they can offer savings compared to buying each item separately.
What Uses Can Lithium Batteries Serve in Daily Life?
Lithium batteries serve a variety of essential functions in daily life due to their efficiency and versatility.
- Consumer Electronics: Lithium batteries are commonly used in smartphones, laptops, and tablets, providing long-lasting power and quick charging capabilities.
- Electric Vehicles: Many electric cars rely on lithium batteries for their energy storage, offering a lightweight and high-capacity solution that enhances driving range and efficiency.
- Power Tools: Cordless power tools frequently utilize lithium batteries, which allow for greater mobility and convenience without the hassle of cords while delivering high performance.
- Wearable Devices: Fitness trackers and smartwatches depend on lithium batteries for their compact size and ability to hold a charge for extended periods, which is essential for everyday use.
- Medical Devices: Lithium batteries power various medical instruments, including pacemakers and portable diagnostic devices, providing reliable energy for critical health monitoring.
- Remote Controls: Many remote controls for TVs and other devices use lithium batteries, ensuring a longer lifespan and consistent performance compared to traditional alkaline batteries.
- Flashlights and Emergency Lighting: Lithium batteries are often found in flashlights and emergency lights, as they deliver bright illumination and can withstand extreme temperatures.
- Home Security Systems: Wireless alarm systems and security cameras often utilize lithium batteries, allowing for flexible placement and uninterrupted operation during power outages.
In consumer electronics, lithium batteries are preferred for their lightweight design and high energy density, which allows devices to remain portable and functional for longer durations without frequent recharging. Electric vehicles benefit from lithium technology due to its ability to provide high voltage and a substantial amount of energy, which is crucial for performance and range.
For power tools, lithium batteries offer the advantage of fast charging and longer runtimes, making them ideal for both professional trades and DIY projects. Wearable devices like fitness trackers have integrated lithium batteries that are small yet powerful enough to support various features like heart rate monitoring and GPS tracking without adding bulk.
In the medical field, lithium batteries ensure that life-saving devices operate reliably, which can be crucial in emergencies. Remote controls benefit from lithium batteries as they maintain functionality over longer periods, reducing the need for frequent replacements.
Flashlights equipped with lithium batteries provide bright light output and are more reliable in extreme conditions, making them essential for outdoor adventures. Home security systems utilizing lithium batteries can be installed in a variety of locations without the constraints of wires, allowing for greater flexibility in securing properties.
How Can You Extend the Lifespan of Your Lithium Battery?
To extend the lifespan of your lithium battery, consider the following tips:
- Avoid Extreme Temperatures: Lithium batteries perform best at moderate temperatures, ideally between 20°C and 25°C. Exposure to high heat can accelerate chemical reactions within the battery, leading to degradation and reduced capacity, while extreme cold can diminish performance and increase the risk of failure.
- Charge Regularly but Not Excessively: Keeping your battery charged between 20% and 80% can help prolong its lifespan. Frequent full discharges and charges can stress the battery, so it’s advisable to avoid letting it drain completely or charging it to 100% unless necessary.
- Use Quality Chargers: Utilizing the charger that came with your device or a reputable third-party charger can ensure that the battery is charged at the correct voltage and current. Cheap or incompatible chargers can deliver inconsistent power, which can lead to overheating and damage over time.
- Store Wisely: If you need to store your lithium battery for an extended period, do so in a cool, dry place and ideally at around 50% charge. Storing it fully charged or completely drained can lead to capacity loss and reduce the battery’s overall lifespan.
- Avoid Deep Discharges: Regularly allowing your battery to drop below a certain voltage can cause harm. Lithium batteries do not benefit from being fully discharged, as this can lead to irreversible damage, so it’s better to recharge when they reach around 20% capacity.
- Limit High-Performance Usage: Intense applications that require high power output can strain your battery. If possible, reduce the use of resource-heavy applications when the battery is low, as this can lessen wear and prolong the overall life of the battery.