It is the PP3 I want charged. I said "prevent being charged when reached its capacity".
I also thought transistor was wrong, but it works fine in the sim, and flipping it only slightly lowers voltage and current.
When 2N222 flipped, PP3+ reads 9.73v, as I understand it slightly more than rated voltage is required to recharge. Is that correct? And is .73 enough extra?
Also, as per original question, am I correct that I need to stop it from "overcharging" because of damaging it, and overheating etc. - if so, how do I do this?
Thanks for the quick response,
Fordy.