The following sub-sections cover the theoretical and mathematical aspects of Lithium-Ion (Li-Ion) battery charging. Last but not least, it is imperative to equip each Lithium-Ion battery pack with its dedicated battery protection board (or Battery Management System aka BMS). Please be aware that the current design has not been certified for safety, consequently it is not suitable for commercial applications and must be implemented at your own risk.
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The author of this page neither takes any responsibility nor can be held liable for any damage caused to human beings and things due to the improper handling of Lithium-Ion batteries. Overcharging, short-circuiting or otherwise abusing Lithium-Ion batteries may result in a fire and/or a violent explosion. Warning: Lithium-Ion batteries are hazardous devices. Older firmware versions may or may not work as described within this article. Please note that the documentation provided on this page always refers to the latest firmware release found on GitHub.
LI ION BATTERY CHARGER UPGRADE
The rationale behind this project was to upgrade the depleted battery pack and charger of an old cordless drill from Nickel-Cadmium (NiCd) to Lithium-Ion (Li-Ion) technology. The same design can be used for charging Lithium-Polymer (LiPo) batteries. It uses the Constant Current Constant Voltage (CC-CV) charging method with end-of-charge detection based on multiple criteria. Following is the tutorial of a DIY Lithium-Ion battery charger implemented on Arduino with several advanced features like state-of-charge estimation, EEPROM logging and command-line interface.
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