# Source: https://learn.adafruit.com/li-ion-and-lipoly-batteries/conclusion.md

# Li-Ion & LiPoly Batteries

## Conclusion

Lithium Ion and Lithium Ion Polymer batteries are a great power source for projects but they require care during use and charging. They can be easy to damage or misuse and can hurt you or your property! All the batteries we sell pass testing and certification but you should still be careful with them. Read the datasheet, follow our suggestions and those in the datasheet as well as common sense!

[The manufacturer of our lithium ion batteries indicates the following warnings and cautions:](http://www.adafruit.com/datasheets/30003-0.pdf)

- Do NOT immerse the battery in water or other liquids. Keep or store the battery in a cool and dry place/environment.&nbsp;  
- Do NOT use or store the battery near any source of heat.
- Use a charger that is clearly specified to be compatible for charging the battery and has appropriate charging protection (voltage, current, temperature)
- Do NOT install the battery in reverse polarity.
- Do NOT connect the battery to an electrical outlet or other incompatible power source.
- Do NOT discard the battery in fire.
- Do NOT short circuit the battery. Do NOT connect the positive and negative terminals to each other with metallic object(s) or other conductive material(s).
- Do NOT transport or store the battery together with metal objects, such as hairpins, necklaces, or any other conductive object or material.
- Do NOT strike, crush, puncture, disassemble, or throw the battery.
- Do NOT directly solder the battery or battery terminals.
- Do NOT pierce the battery.
- Lithium batteries should be used only with proper voltage, current, and temperature protection circuitry and protection.&nbsp;  

- Do NOT use or leave the battery in a high temperature environment (for example, under direct sunlight or in a vehicle in hot weather). Failure to take this precaution can lead to overheating of battery and/or fire or explosion. Also, performance of battery will degrade and lifetime will be reduced.
- Do NOT use battery in a location where there is high static-electricity or magnetic fields, otherwise safety devices may be damaged which cannot be visible.
- If the battery leaks and the electrolyte get into the eyes, do NOT rub eyes. Instead, rinse and wash eyes with clean water, and immediately seek medical attention.
- It the battery gives off an odor, generates heat, becomes discolored or deformed, or in any way appears abnormal during use, recharging, or storage, immediately remove it from the device or battery charger and stop using it.
- In case the battery terminals are dirty, clean the terminals with a dry cloth before use. Otherwise, poor performance may occur due to the poor connection with the instrument or device.
- Be aware that discarded batteries may cause fire or explosion. Therefore, apply a non-conductive tape to the battery terminals to insulate them before discarding.

**Temp sensor&nbsp;FAQ:&nbsp;** Most DIY/hobbyist chargers don't come with temperature sensors built in because they are not always right next to your battery and they are intended to be used at low charge rates and indoors where the temperature is around 25 degrees C. If you want to charge your batteries at high rates (above 0.5 **C** ) or outdoors, you should get a temperature-based charging solution.

- [Previous Page](https://learn.adafruit.com/li-ion-and-lipoly-batteries/proper-charging.md)
- [Next Page](https://learn.adafruit.com/li-ion-and-lipoly-batteries/downloads.md)

## Featured Products

### Adafruit Micro Lipo - USB LiIon/LiPoly charger

[Adafruit Micro Lipo - USB LiIon/LiPoly charger](https://www.adafruit.com/product/1304)
Oh so adorable, this is the tiniest little lipo charger, so handy you can keep it any project box! Its also easy to use. Simply plug in the gold plated contacts into any USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. There are...

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### USB LiIon/LiPoly charger

[USB LiIon/LiPoly charger](https://www.adafruit.com/product/259)
This is a Lithium Ion and Lithium Polymer battery charger based on the [MCP73833](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en027785). It uses a USB mini-B for connection to any computer or 'USB wall adapter'. Charging is performed in three stages: first a...

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### USB/DC  Lithium Polymer battery charger 5-12V

[USB/DC  Lithium Polymer battery charger 5-12V](https://www.adafruit.com/product/280)
Charge your single-cell lithium ion/polymer battery any which way you like with this board. Have a USB connection? No problem, just plug into the miniUSB connector. Only have a wall adapter? Any standard 2.1mm DC adapter which puts out 5 to 12VDC will work fine. If both are plugged in, the...

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### Lithium Ion Battery Pack - 3.7V 6600mAh

[Lithium Ion Battery Pack - 3.7V 6600mAh](https://www.adafruit.com/product/353)
Need a massive battery for your project? This lithium-ion pack is made of 3 balanced 2200mAh cells for a total of 6600mA capacity! The cells are connected in parallel and spot-welded to a protection circuit that provides over-voltage, under-voltage, and over-current protection.

Each cell...

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### Lithium Ion Battery Pack - 3.7V 4400mAh

[Lithium Ion Battery Pack - 3.7V 4400mAh](https://www.adafruit.com/product/354)
Need a big battery for your project? This lithium-ion pack is made of 2 balanced 2200mAh cells for a total of 4400mA capacity! The cells are connected in parallel and spot-welded to a protection circuit that provides over-voltage, under-voltage, and over-current protection.

Each cell can...

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### Lithium Ion Polymer Battery - 3.7v 2500mAh

[Lithium Ion Polymer Battery - 3.7v 2500mAh](https://www.adafruit.com/product/328)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of **2500mAh** for a total of about 10 Wh. If you need a smaller battery, <a...></a...>

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### Lithium Ion Polymer Battery - 3.7v 1200mAh

[Lithium Ion Polymer Battery - 3.7v 1200mAh](https://www.adafruit.com/product/258)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 1200mAh for a total of about 4.5 Wh. If you need a larger battery, <a...></a...>

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### Lithium Ion Polymer Battery - 3.7v 500mAh

[Lithium Ion Polymer Battery - 3.7v 500mAh](https://www.adafruit.com/product/1578)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 500mAh for a total of about 1.9 Wh. If you need a larger (or smaller!) battery, <a...></a...>

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