How to convert a battery pack to AC power?
Wife owns a very expensive piece of Japanese cosmetic device that uses a very special Li-ion battery pack but the battery died! No way I can find a replacement for the battery pack. The battery pack available only has 2 wires (black and red) but not 3 wires (the yellow wire). I am afraid if I get a 2-wire battery pack, it won't work at all. There are lipo battery packs, but I don't think I can replace li-ion with lipo battery packs?!
I am wondering how to convert it to an AC power?
I have no experience doing this at all, so if you can provide as many details as possible, that will be great!
The battery pack:
3 wires connected to the connector: red, black and yellow; 7.4V, 750mAh
The AC adapter used for recharging the device:
INPUT: 100VAC 50/60 Hz 8VA
OUTPUT: 9VDC 500mA
Thanks a lot!