If you want to use the tool battery until it expires, do this: 

#TookitRC M7 Charger#External discharge#DIY addictor
There are three discharge functions of the ToolkitRC M7 charger: self-discharge (up to 10W) through internal resistance, Recycle discharge (charging other batteries with discharge energy), and External discharge (dissipating discharge energy through the load). .
In the video, we will introduce how to quickly discharge a large capacity battery or tool battery to 3.7~3.8V, which is the storage mode voltage, by using an automobile heater device as a load.
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Related video link
When storing a lithium-ion battery for a long period of time, be sure to discharge it to the storage voltage before storing it. • 리튬이온 배터리 장기보관할 경우 꼭 스토...
When it comes to tool battery management, discharging is as important as balancing and charging!! • 공구 배터리 관리는 밸런싱 충전 못지 않...
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