I have a SAD light that is used for seasonal depression, that I bought ten or fifteen years ago. I haven’t used it but my daughter wanted to try it, so I found it and it works, but it won’t hold a charge.
I opened it up and found the series of rechargeable batteries. They are 2/3AA size and there are seven in series, each one is 1.2 V and 750 mAH. Each one reads over 1.2 volts except for one, which has no voltage.
I was going to replace just that one, but I don’t know whether it is NiCd or some other type.
I took off the plastic wrap that held all 7 of them together, but there is no information at all on the individual batteries.
The label on the plastic wrapping said:
If I knew what type of batteries they are, I could buy one to replace the bad cell.
I guess I could upgrade and buy 7 NiMH batteries, but then the charger probably would not be appropriate, from what I’ve read.
So I don’t know how to tell what type of batteries these are. If I knew, maybe I could replace the one bad battery. Or, I could buy 7 NiMH batteries, but I’d need to know if the charger would work without damaging the batteries.
I would be grateful for any advice on how to proceed. Thanks very much.