I'm building a new battery pack for an electric drill. One of the cells went dead, but I'm replacing all three to make sure they match.
The new battery pack will have 3 AA NiCd cells in series. Each one will have 1000 mAh and 1.2V. The original charger has an output of 4.2V AC ~ 100mA. Will this be sufficient to charge the new pack? Also, how long should I charge?
I've read tons of info on charging single batteries, but I can't seem to find any info on charging them in series.
I appreciate the responses and thought I'd let you all know how it turned out. I ended up leaving out the diode from the old battery pack, and swapping out the proprietary charger connector with a more standard one. Rather than reusing the original charger, I have it on a smart hobby charger. This new charger can be set for multiple configurations, including 3s NiCd, and charges them up accordingly. So the cells charged up happy at 100mA, and the drill now works perfectly again!