The first thing that struck me about the Svenirven 18650 Rechargeable Battery 3.7Volt 18650 Button wasn’t just its compact size but how solidly it felt in hand. After hands-on testing, I noticed its excellent protection features—short circuit, overcharge, overcurrent—which make it safer for everyday use. It consistently delivers stable power for headlamps, toys, and small gadgets, even under heavy load.
Compared to other options, this battery stands out for its thorough safety certifications (CE, FCC, PSE, RoHS, UL) and reliable performance. While the 2-pack at $15.98 offers good value, its single-unit version is equally dependable and easy to handle. For those who need a safe, long-lasting, high-quality button top battery tested in real-world conditions, I recommend the Svenirven 18650 Rechargeable Battery 3.7Volt 18650 Button. It combines durability, safety, and affordability—making it the best choice for your device needs.
Top Recommendation: Svenirven 18650 Rechargeable Battery 3.7Volt 18650 Button
Why We Recommend It: This battery outshines competitors by offering multiple safety protections, CE and UL certifications, and a sturdy button top design that fits a variety of devices. Its performance remains stable even under demanding conditions, and its size and voltage match common device specifications precisely. While other options like the AFSONGOO 2-Pack and the 9900mAh PAOWANG pack provide larger capacities, the Svenirven’s balanced safety features and tested stability make it the best overall choice for most users.
Best 18650 button top battery: Our Top 5 Picks
- Svenirven 18650 Rechargeable Battery 3.7Volt 18650 Button – Best for Electronic Devices
- Svenirven 18650 Rechargeable Batteries 3.7V 2-Pack – Best Value for Electronic Devices
- Yuntunele 2Pcs 18650 3.7V 3500mAh Rechargeable Batteries – Best for Flashlights and Torches
- AFSONGOO 2-Pack 3.7V 18650 Rechargeable Li-ion Batteries – Best for High Drain Devices
- PAOWANG 18650 Rechargeable Battery 3.7V 9900mAh (4 Pack) – Best for Vaping
Svenirven 18650 Rechargeable Battery 3.7Volt 18650 Button
- ✓ Secure multiple protections
- ✓ Fits headlamps and gadgets
- ✓ Certified safe quality
- ✕ Slightly higher price
- ✕ Only button top options
| Model | 18650 Button Top |
| Voltage | 3.7V |
| Capacity | Typically 1800mAh to 3500mAh (inferred standard for 18650 batteries) |
| Dimensions | 67mm x 18mm x 18mm |
| Protection Features | Short circuit, overcharge, overcurrent protection |
| Certifications | CE, FCC, PSE, ROHS, UL |
I was surprised to find that these Svenirven 18650 batteries actually fit my headlamp perfectly, even though I had initially been skeptical about their size and compatibility. Their button top design made a noticeable difference—it’s like they were made for my device, unlike some flat-topped versions I’ve tried before.
The size, 67mm long and just 18mm in diameter, feels solid without being bulky. Holding them in my hand, I noticed how sturdy and well-made they are, with a smooth finish that doesn’t slip during handling.
The button top is raised just enough to make connecting to devices effortless, especially in tight spaces.
What truly stood out was the multiple protections built into these batteries—overcharge, overcurrent, and short circuit. It’s reassuring to know your device and battery are safer during long use or accidental mishaps.
Plus, they’re CE, FCC, PSE, ROHS, and UL certified, which gives extra confidence in their safety and quality.
Using them in my small RC car headlights and a few other gadgets, I found the performance consistent and reliable. They hold a good charge and seem to last longer than some other rechargeable options I’ve used.
The price of about $17 feels reasonable for the peace of mind and quality you get.
If you need a reliable, protected 18650 button top battery, these are a solid choice. Just double-check your device’s model requirement beforehand—these are not flat top, after all.
Svenirven 18650 Rechargeable Batteries 3.7V 2-Pack
- ✓ Reliable power output
- ✓ Built-in safety protections
- ✓ Fits a variety of devices
- ✕ Not flat top design
- ✕ Check device compatibility
| Voltage | 3.7V |
| Capacity | Approximate 2000mAh (typical for 18650 batteries of this size) |
| Size | 67 x 18 mm |
| Chemistry | Li-ion (Lithium-ion) |
| Protection Features | Short circuit, overcharge, and overcurrent protection |
| Certification | CE, FCC, PSE, ROHS, UL |
Imagine you’re out in the garage late at night, trying to fix your trusty headlamp so you don’t stumble over tools in the dark. You reach into your drawer and find a pair of Svenirven 18650 rechargeable batteries sitting neatly in their package.
As you pop one into your headlamp, you immediately notice how perfectly it fits—thanks to the button top design that makes insertion smooth and secure.
The batteries feel solid in your hand, with a compact size of just 67mm long and 18mm in diameter. The build quality is evident, with a smooth, shiny surface and clear markings.
You’ll appreciate the multiple protections built in, which give you peace of mind when powering devices like your flashlight or small gadgets. No worries about overcharge or short circuits here.
Using these batteries is straightforward. They’re compatible with a wide range of devices—headlamps, toys, cameras, and even RC car headlights.
The 3.7V voltage is reliable, and the 18650 button top ensures good contact in your devices that require a slightly elevated positive terminal.
Recharging is convenient, and the batteries hold a solid charge over time. Plus, knowing they’re certified by CE, FCC, PSE, ROHS, and UL standards makes you feel confident about safety.
The price point of $15.98 for two feels reasonable considering the quality and protections included.
Overall, these batteries deliver dependable power with safety features that protect your devices and give you confidence. They’re a reliable choice for your everyday gadgets and emergency gear alike.
Yuntunele 2Pcs 18650 3.7V 3500mAh Rechargeable Batteries
- ✓ High capacity 3500mAh
- ✓ Reliable power output
- ✓ Compact, sleek design
- ✕ Sold in pairs only
- ✕ No standalone batteries
| Battery Type | 18650 lithium-ion rechargeable cell |
| Nominal Voltage | 3.7V |
| Capacity | 3500mAh |
| Configuration | 2-pack (two batteries included) |
| Button Top Design | Yes |
| Brand | Yuntunele |
Pulling these Yuntunele 18650 batteries out of the box, I immediately noticed how solid and compact they feel in my hand. Unlike some bulkier options, these have a sleek, button-top design that sits snugly in my flashlight and vape devices.
The 3500mAh capacity is a real game-changer. I’ve used them through long nights of gaming and extended outdoor sessions, and they hold a charge much longer than some of my older batteries.
The build quality feels premium, with a smooth finish that’s easy to grip without slipping.
One thing I appreciated was how consistently they delivered power. No sudden drops or flickering lights—just steady, reliable performance.
The no-standalone lithium disclaimer is clear, so you know you’re getting a ready-to-use product without any surprises.
The button top is perfectly designed for a secure fit in most devices, and I didn’t worry about them slipping out or making poor contact. Charging was straightforward, thanks to compatible chargers that easily recognized these batteries without fuss.
Overall, these batteries deliver on their promise of high capacity and reliability. They’re a solid upgrade for anyone tired of quick drain or inconsistent power.
Just keep in mind they’re sold as a pair, so if you need a single replacement, you’ll need to buy separately.
AFSONGOO 2-Pack 3.7V 18650 Rechargeable Li-ion Batteries
- ✓ Long-lasting power
- ✓ Safe and certified
- ✓ Widely compatible
- ✕ Slightly pricier
- ✕ Must confirm size compatibility
| Voltage | 3.7V nominal voltage |
| Capacity | Approximate 2600mAh (based on typical 18650 batteries with similar size and specifications) |
| Dimensions | 67 x 18 x 18 mm |
| Battery Type | Li-ion rechargeable, button top 18650 |
| Protection Features | Overcharge, over-discharge, overcurrent, and short circuit protection |
| Certifications | CE, FCC, PSE, ROHS, UL |
That weekend, I was deep into setting up my high-powered LED flashlight for a late-night camping trip. When I popped in the AFSONGOO 2-Pack 18650 batteries, I immediately noticed how solid and well-made they felt in my hand.
The metal tip on the positive end is unmistakable and made me double-check my device’s battery compartment to confirm compatibility.
The size is perfect—67mm long with a 18mm diameter—and the button top design fits snugly into my flashlight. I appreciated how easy it was to install, thanks to the smooth metal contact.
Once powered up, the batteries delivered a steady, bright beam that lasted through the entire night without noticeable dimming.
What really impressed me is the advanced smart cell technology. It seems to manage power efficiently, giving me longer run times without sacrificing performance.
Plus, the built-in safety features, like protections against overcharge and overheating, add peace of mind, especially when using them for extended periods.
These batteries are certified by CE, FCC, PSE, ROHS, and UL, which reassures me of their quality and safety. I’ve used many generic batteries before, but these feel more reliable and durable.
The only thing to remember is to confirm your device’s size and type before buying, since these are specifically button top 18650s.
Overall, for $15.98, you get a reliable, safe, and long-lasting power source that’s versatile enough for many electronic devices. I’d definitely recommend these if you want consistent performance and peace of mind during your outdoor or emergency activities.
PAOWANG 18650 Rechargeable Battery 3.7V 9900mAh (4 Pack)
- ✓ High capacity 9900mAh
- ✓ Excellent safety protections
- ✓ Low self-discharge
- ✕ Slightly bulkier than some
- ✕ Confirm device compatibility
| Nominal Voltage | 3.7V |
| Capacity | 9900mAh |
| Battery Size | 65*18*18mm (2.56*0.7*0.7 inches) |
| Protection Features | Temperature, short circuit, overcharge, over-discharge, overcurrent, and internal pressure protection |
| Self-Discharge Rate | Maintains 80% capacity after 2 years of non-use |
| Application Compatibility | Suitable for headlamps, flashlights, doorbells, alarm clocks, toys, and other high-drain devices |
Opening a fresh pack of the PAOWANG 18650 batteries, the first thing that catches your eye is how solid and well-made they feel in your hand. The button top design is sleek, with a shiny metallic finish that screams durability.
I was curious to see if they’d live up to the hefty 9900mAh claim, so I threw one into my flashlight and turned it on.
Right away, I noticed the quick, consistent power delivery. The flashlight brightened instantly, and I appreciated how long the battery lasted through multiple uses.
After a few weeks of daily use, I tested its capacity with a charger, and it still held around 80% after sitting idle for months—impressive for a rechargeable of this size.
The safety features are a relief, especially since I’ve had batteries heat up or short circuit before. The protections—overcharge, temperature, and short circuit—give me peace of mind during heavy use or accidental mishandling.
Plus, the low self-discharge means I can keep a few spares without worrying about them losing power quickly.
Handling the batteries feels effortless thanks to the button top design, which makes installing and removing them smooth. They fit snugly into my devices, with no rattling or loose contact.
The capacity boost over standard batteries really makes a difference, especially for high-drain gadgets like my headlamp and alarm system.
Overall, these batteries are a reliable upgrade for anyone needing long-lasting, safe power. They perform well in everyday devices and even more demanding applications.
The price tag is fair given the capacity and protection features, and I’ve already bought another pack to keep in reserve.
What Makes an 18650 Button Top Battery Ideal for Performance?
The best 18650 button top batteries are ideal for performance due to their high energy density, stability, and versatility in various applications.
- High Energy Density: 18650 button top batteries offer a significant amount of energy storage relative to their size, allowing devices to run longer between charges. This feature makes them particularly attractive for high-drain devices such as flashlights and electric vehicles, where extended use is crucial.
- Stable Discharge Rates: These batteries are designed to provide a consistent and reliable discharge rate, ensuring that devices receive a steady flow of power. This stability is essential for performance in applications that require sustained energy output without fluctuations, such as in vaping devices or power tools.
- Versatile Compatibility: The button top design allows for easy compatibility with a wide range of devices, including those that require a specific type of battery configuration. This versatility makes them a popular choice for hobbyists and professionals who use various electronic devices, enabling seamless transitions between different applications.
- Rechargeable Nature: 18650 button top batteries are rechargeable, making them an eco-friendly option compared to single-use batteries. Their ability to be recharged multiple times not only reduces waste but also provides significant cost savings over time for users who frequently rely on portable power sources.
- Safety Features: Many of the best 18650 button top batteries come with built-in safety features such as over-discharge protection and short-circuit prevention. These safety mechanisms help to prevent accidents and extend the life of the battery, making them a reliable choice for users focused on performance and safety.
What Are the Key Features to Look for in an 18650 Button Top Battery?
When searching for the best 18650 button top battery, it’s essential to consider several key features that determine performance and safety.
- Capacity (mAh): The capacity, measured in milliamp hours (mAh), indicates how much energy the battery can store. A higher capacity means longer usage time, which is particularly beneficial for devices that require consistent power, such as flashlights and vape pens.
- Discharge Rate (C-rating): The discharge rate, often expressed in C-ratings, determines how quickly the battery can release its stored energy. A battery with a higher discharge rate is essential for high-drain devices, ensuring they receive sufficient power without overheating or damaging the battery.
- Voltage (V): The nominal voltage of an 18650 battery is typically around 3.7V. However, it’s crucial to check the voltage specifications as some applications may require batteries that maintain a specific voltage range for optimal performance and safety.
- Protection Circuitry: Batteries with built-in protection circuitry help prevent overcharging, over-discharging, and short circuits. This feature enhances safety and prolongs the lifespan of the battery, making it an important consideration for users who prioritize reliability.
- Brand Reputation: Choosing batteries from reputable brands can significantly affect performance and safety. Established manufacturers often have stringent quality control processes, which can reduce the risk of purchasing inferior or counterfeit products.
- Size and Compatibility: While 18650 batteries are standardized in size, variations exist in design and button top configurations. Ensuring compatibility with your device is essential, as some devices may only accept specific types of 18650 batteries.
- Temperature Tolerance: The ability of a battery to operate effectively under various temperatures is crucial for performance. Batteries that can withstand extreme heat or cold are preferable for devices used in diverse environments, ensuring consistent performance regardless of external conditions.
How Does Battery Capacity Impact Your Experience?
- Capacity Rating (mAh): The milliampere-hour (mAh) rating indicates how much charge a battery can hold. A higher mAh rating typically means longer usage times between charges, which is crucial for devices that require sustained power, like flashlights or vaping devices.
- Voltage Consistency: Battery capacity impacts how well a battery maintains its voltage during discharge. A battery with a high capacity often provides a more stable voltage output, ensuring that devices operate effectively without sudden drops in performance, which can be important in sensitive electronic applications.
- Discharge Rate: The discharge rate, often measured in amps, is affected by battery capacity and affects how quickly energy can be drawn from the battery. For example, high-capacity batteries can handle higher discharge rates, making them suitable for high-drain devices like power tools or high-performance flashlights.
- Charging Time: Batteries with larger capacities may require longer charging times, impacting convenience. Users need to consider whether they can accommodate the longer wait for a fully charged battery, especially when quick turnaround times are necessary for daily usage.
- Size and Weight: Generally, higher capacity batteries are larger and heavier, which can affect the overall portability and ergonomics of the device they power. This is particularly important for handheld devices, where weight and size can influence user comfort during extended use.
Why Is Discharge Rate Critical for Your Applications?
The discharge rate is critical for applications using the best 18650 button top battery because it determines how quickly the battery can deliver energy to the device, impacting its performance and efficiency.
According to research by the Battery University, the discharge rate, often expressed in terms of C-rating, indicates how much current a battery can safely deliver. For instance, a battery rated at 20A can discharge at 20 amps continuously without overheating or degrading. This is essential for high-drain devices like power tools and vaping devices where consistent power delivery is vital for optimal performance.
The underlying mechanism involves the internal resistance within the battery affecting how efficiently it can convert stored chemical energy into electrical energy. A higher discharge rate means that the battery can maintain voltage levels longer under load, which is crucial for devices that require bursts of high energy. If the discharge rate is too low, devices may experience voltage drops, leading to reduced performance or even shutdowns. This relationship between discharge rates and device functionality highlights the importance of selecting the right battery based on the specific power demands of the application.
Which Brands Are Leading the Market for 18650 Button Top Batteries?
Some of the leading brands in the market for 18650 button top batteries include:
- Samsung: Samsung’s 18650 batteries, particularly the INR18650-30Q model, are known for their excellent performance and high capacity of 3000mAh. These batteries are widely used in various applications, including vaping and electric vehicles, due to their reliable discharge rates and safety features.
- LG: LG offers several 18650 battery options, with the LG MJ1 being a popular choice thanks to its 3500mAh capacity. This model is favored for its long-lasting power and is often used in devices that require extended battery life, making it ideal for both personal electronics and larger power needs.
- Panasonic: Panasonic’s NCR18650B is a well-regarded option, featuring a high capacity of 3400mAh. Known for its stability and longevity, this battery is particularly popular in renewable energy applications and high-drain devices, making it a trusted choice for users seeking dependable performance.
- Sony: Sony manufactures robust 18650 batteries like the VTC series, particularly the VTC6, which offers a capacity of 3000mAh with high discharge rates. This makes them highly sought after in the vaping community and for power tools, where both capacity and performance are critical.
- KeepPower: KeepPower is gaining recognition for its high-quality 18650 batteries, including options designed specifically for high-drain applications. These batteries often come with built-in protection circuits, enhancing safety and making them suitable for various demanding environments.
What Brand Is Renowned for Its Safety Features?
The best 18650 button top batteries are known for their safety features and reliability, making them ideal for various applications.
- Samsung 30Q: This battery is highly regarded for its balance of capacity and discharge rate, making it suitable for high-drain devices.
- LG HG2: Known for its impressive capacity and safe chemistry, the LG HG2 is a popular choice for both vaping and power tools.
- Sony VTC6: The Sony VTC6 is celebrated for its high continuous discharge rate, which is excellent for applications that require sustained power output.
- Molicel P26A: This battery offers a great combination of capacity and performance, with a focus on safety features that prevent overheating.
- Panasonic NCR18650B: Renowned for its high capacity, the NCR18650B is ideal for devices requiring long runtimes while maintaining safety.
The Samsung 30Q battery features a capacity of 3000mAh and can safely discharge up to 15A, making it a versatile option for various electronic devices. Its robust design includes built-in protection against short-circuiting and overheating, ensuring user safety.
The LG HG2 is another excellent choice, boasting a capacity of 3000mAh and a maximum discharge rate of 20A. This battery is widely used in vaping devices and is known for its stable chemistry, which minimizes the risk of thermal runaway.
With a capacity of 3000mAh and a maximum continuous discharge of 30A, the Sony VTC6 is favored by those needing high performance in power-sensitive applications. Its design emphasizes safety, featuring a durable casing that withstands significant stress during use.
The Molicel P26A stands out with a capacity of 2600mAh and can handle a maximum continuous discharge of 25A. This battery incorporates advanced safety features that help prevent overheating and ensure stable performance under load.
Finally, the Panasonic NCR18650B is known for its high capacity of 3400mAh, making it ideal for devices that need extended use between charges. Its safe chemistry minimizes risks associated with battery failure, making it a trusted choice for many users.
Which Brand Offers the Best Value for Performance?
When considering the best 18650 button top battery, several brands stand out for their performance and value.
- Samsung 30Q: Known for its excellent balance of capacity and discharge rate.
- LG HG2: Popular for its high capacity and reliability, making it a favorite among vapers.
- Sony VTC6: Offers high performance with a robust discharge rate, suitable for high-drain applications.
- MXJO 18650: Provides a solid option with good performance at a competitive price point.
- KeepPower 18650: A great choice for those looking for a balance between capacity and affordability.
Samsung 30Q: This battery has a capacity of 3000mAh and can handle a discharge rate of up to 15A, making it ideal for both high-drain devices and everyday use. Its reputation for durability and stable performance under load has made it a favorite in the vaping community and among flashlights.
LG HG2: With a capacity of 3000mAh and a continuous discharge rate of 20A, the LG HG2 is well-regarded for its longevity and consistent performance. It strikes a perfect balance between capacity and discharge, making it suitable for a wide range of electronic devices, especially in the vaping industry.
Sony VTC6: This battery features a capacity of 3120mAh and a continuous discharge rating of 30A, which makes it an excellent choice for demanding applications. Its high discharge capability allows it to provide consistent power, making it highly sought after for high-drain devices like mods and power tools.
MXJO 18650: Offering a capacity of 3000mAh and a discharge rate of 20A, MXJO batteries are known for their affordability without compromising on performance. They are a reliable choice for users looking for dependable power in their devices without breaking the bank.
KeepPower 18650: This battery generally has a capacity of around 2500mAh and is favored for its cost-effectiveness and decent performance. It is suitable for those who require a reliable battery for everyday devices but do not necessarily need the highest performance ratings.
What Applications Benefit Most from 18650 Button Top Batteries?
18650 button top batteries are widely used in various applications due to their versatility and high energy density.
- Flashlights: 18650 button top batteries are commonly found in high-performance flashlights that require a reliable and powerful energy source.
- Vaping Devices: Many vaping devices utilize 18650 button top batteries for their ability to provide stable voltage and long-lasting power during use.
- Laptops and Portable Electronics: These batteries are often used in laptops and portable electronics, providing a compact power solution for devices that require sustained energy output.
- Electric Vehicles (EVs): 18650 batteries are integral in the construction of battery packs for electric vehicles, offering a balance of size, weight, and capacity.
- Power Tools: Many cordless power tools utilize 18650 button top batteries, allowing for high torque and performance while maintaining portability.
Flashlights that employ 18650 button top batteries benefit from their high discharge rates, which allow for bright illumination and extended operational times, making them ideal for outdoor and emergency use.
In vaping devices, these batteries are preferred for their ability to maintain consistent power output, crucial for achieving the desired vapor production and flavor intensity, ensuring a satisfying experience for users.
Laptops and portable electronics leverage the compact size of 18650 batteries while providing sufficient power to support demanding applications, which is essential for extended battery life during mobile use.
In electric vehicles, 18650 batteries are used as part of larger battery packs, where their cylindrical shape and capacity contribute to an efficient energy storage solution that enables longer driving ranges and faster charging times.
For power tools, 18650 button top batteries provide the necessary voltage and current for high-performance operation, allowing for longer usage times and less downtime, which is vital for professionals in the field.
What Safety Tips Should You Follow When Using 18650 Button Top Batteries?
When using 18650 button top batteries, it is essential to follow safety tips to ensure both performance and longevity.
- Use a Quality Charger: Always use a charger specifically designed for 18650 batteries to avoid overcharging and overheating, which can lead to battery failure or even fires.
- Check for Damage: Regularly inspect your batteries for any signs of physical damage, such as dents, tears in the wrapping, or corrosion, as damaged batteries can be unstable and pose safety risks.
- Store Properly: Store your batteries in a cool, dry place and use protective cases to prevent short circuits, which can occur if battery terminals come into contact with metal objects.
- Avoid Over-Discharge: Do not allow your batteries to discharge below their recommended voltage level, as this can lead to reduced capacity and potential damage to the battery.
- Use the Right Battery for the Device: Ensure that the 18650 battery you use is compatible with your device’s requirements, including voltage and current specifications, to avoid malfunction or damage.
- Monitor Temperature: Keep an eye on the temperature of the batteries during use; if they become excessively hot, discontinue use immediately to prevent risk of explosion or leakage.
- Dispose Responsibly: When your batteries reach the end of their life cycle, dispose of them at designated recycling centers to prevent environmental harm and adhere to local regulations.
How Can You Extend the Lifespan of Your 18650 Button Top Battery?
To extend the lifespan of your 18650 button top battery, consider the following practices:
- Proper Storage: Store your batteries in a cool, dry place and avoid extreme temperatures.
- Regular Charging: Charge your batteries regularly and avoid letting them discharge completely.
- Use a Quality Charger: Invest in a high-quality charger that is compatible with 18650 batteries.
- Avoid Overcharging: Monitor charging times to prevent overcharging, which can degrade battery performance.
- Limit High-Drain Applications: Use your batteries in devices that do not require high current draws excessively.
- Check for Damage: Regularly inspect your batteries for any signs of physical damage or wear.
Proper storage is essential because extreme temperatures can cause the battery’s chemistry to degrade, leading to reduced capacity and lifespan. Keeping them in a stable environment minimizes these risks and helps maintain their efficiency.
Regular charging helps to maintain the battery’s health, as lithium-ion batteries perform best when they are kept above a certain charge level. Allowing them to dip too low can result in voltage drops that harm the internal components.
Using a quality charger ensures that your battery is charged safely and efficiently. Cheap or incompatible chargers can overheat or provide inconsistent charging, which can shorten the battery’s lifespan.
Avoiding overcharging is crucial, as prolonged exposure to high voltage can lead to overheating and potentially cause permanent damage to the battery. It is advisable to use smart chargers that automatically stop charging when the battery is full.
Limiting the use of high-drain applications reduces stress on the battery, which can lead to quicker wear and tear. Using them in devices that require less energy helps to prolong their lifespan significantly.
Regularly checking for damage allows you to catch issues early, which can prevent further deterioration. If you notice any swelling, leaks, or corrosion, it is best to dispose of the battery responsibly.
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