Why its important to keep batteries charged whilst not in use.Lithium batteries generally have BMS battery management systems that are a small computor that protects the battery. When the battery is not in use the BMS is continuing to protect the battery against temperture, surges, electrical faults and many other things. In addition there is also Parasitic Drain.
Parasitic Drain
Parasitic draw, also called drain, is the electric current that flows through a vehicle, both while it runs and after the ignition is turned off. You know how you can forget to turn off your headlights, and then your car won’t start the next day? Well, this is just one example of parasitic drain. Modern cars and trucks can easily come equipped with over 50 onboard computers tied together in a single system. This means there are numerous operations using electricity in vehicles, even when the engine is not running.
Once the engine is turned off, most cars computer systems will enter sleep mode, and reduce the amount of parasitic draw to less than 0.05 of an amp. Alarms, stereo systems, clocks, interior lights, engine management computers, GPS, Bluetooth, Wifi, charging docks, seat heating modules, and more are just a few operations that can drain a vehicle’s battery while the engine is off. Even bad instrument panels are known to cause parasitic drain. If one or more system fails to “go to sleep”, it can use up enough electricity to discharge a battery overnight.
The BMS requires power to run and like any appliances when the voltage drops below the required level it switches off. The only way to restart is too recharge the cells seperatly to the required level. This means desmantling the battery to acccess each cell

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