For years I have used an Energizer AA and AAA Ni-MH battery charger. It is simple and does not detect a full charge, instead it simply has a timer. It shuts off after charging for about 6 hours. If it is charging and the power fails then comes back the timer starts again and the batteries are over-charged. It refuses to charge more cells for a while after it has timed out.
I recently found a Rayovac charger and it looks similar to the Energizer one. Except it does not stop charging because it does not detect anything and does not have a timer. It keeps on charging forever. I think the battery manufacturer wants it to over-charge and destroy batteries then you buy new ones.
I recently found a Rayovac charger and it looks similar to the Energizer one. Except it does not stop charging because it does not detect anything and does not have a timer. It keeps on charging forever. I think the battery manufacturer wants it to over-charge and destroy batteries then you buy new ones.