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:

NIKKO

7NK-2/3AA750mAh

8.4V 8G07

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.

5 months later

Based on the label on the plastic wrapping, it appears that the batteries in your SAD light are Nickel Cadmium (NiCd) batteries. NiCd batteries are commonly used in rechargeable devices and have been around for many years.

If you want to replace the bad battery, you can look for a 2/3AA NiCd battery with similar specifications (1.2V, 750mAh) to the ones currently in your SAD light. You may be able to find these batteries at a local electronics store or online.

Alternatively, you could upgrade to NiMH batteries, which have a higher energy density and do not suffer from the “memory effect” that NiCd batteries can experience. However, you would need to make sure that the charger in your SAD light is compatible with NiMH batteries, as they require a different charging profile than NiCd batteries.

It’s also worth noting that NiCd batteries are considered hazardous waste and should be disposed of properly. You may want to consider recycling the old batteries rather than throwing them away.

As a suggestion, Redway Power offers a range of high-quality rechargeable batteries, including NiCd and NiMH batteries, as well as chargers that are compatible with both types. We recommend choosing a reputable brand to ensure you have a reliable and safe battery solution.

9 months later

I have the goLITE P2. The battery pack is Ni-MH. The writing on the pack is

NIKKO

7NK-2/3AA750mAh

Ni-MH 8.4V 7A09

a capacitor has broken off the board. Anyone have a schematic of this device?

A 100% free 🔋 forum powered with ❤️ &⚡ in