Quote "Don't recharge NiMH's in an old NiCad charger Newer chargers handle both NiMH's and NiCads. Older chargers handle only NiCads. If you have NiMH batteries, make sure your charger can handle them. Otherwise, you'll ruin your batteries (and maybe start a fire). If your charger isn't specifically labeled as handling NiMH batteries, then don't put NiMH batteries in it."
that of course should read charger. Will charge 1,2,3 or 4 batteries AA or AAA. Just plug in and it will do the rest on any of the older or present capacities. Switches charger to trickle charge when it detects the correct charged voltage. Even has thermal protection. I use one regularly. Brian