Anyone who has ever owned a cordless drill knows that the batteries are a problem.
BTW, I am told that you can overcome the problem of Battery “memory” by applying a high amount of amperage at the batteries rated voltage across its terminals of the defective battery.
This apparently will blow away the memory junction in the battery.
Caveat: “Kids... dont try this at home”
The only way you can apply more amperage is to either up the voltage or lower the resistance of the circuit. Neither one seems very feasible when charging batteries.
Not charging the battery....”clearing” the battery
Just crank up the amps on a power supply and tap the terminals for a split second.
Caveat: I dont condone this experiment