What I do after the block of 12 batteries has been fully charged, I switch off the power to the adapter, but I leave the batteries in the adaptor. After 15 min when the batteries have cooled enough, I switch on the power again and I get another 30 min charge on top.If I understand correctly, you expect the batteries to cool after being charged, and then make a new charging?
In this case, you will have no gain in battery life, but will only shorten its lifetime.
I recommend NOT recharge a battery that is already full.
please help me with this!
After I charge the batteries and let them cool down, I have measured the voltage and it is on average 1.1V. When I put them back in the (eneloop) charger, the light goes red and it charges for another half hour before light goes green. I take the batteries out, let them cool again and re measure, I get a voltage of 1.15 - 1.18 V.
Furthermore, with nearly empty batteries, it takes a long time for batteries to recharge in a 12 battery block, several hours. During the charge, the batteries do get warm, guess about 40 DegC , 105 deg F. I have been worried about this as I have heard stories of exploding batteries. From first hand experience, I had a battery in my Macbook Pro that became very hot and burned out.
I happy to take any advice