DIYbanter - View Single Post - What is the trick to replacing rechargeable batteries please?

John Tserkezis

On 20/02/2010 2:16 PM, hr(bob) wrote:

... Replace all batteries, using NMH
rather than NiCad, as they have larger capacity...

This can't usually be done, because the end of charge algorithms on the
smart chargers won't won't be compatible with the different cell technology.
It's very possible a charger for NiCads can grossly overcharge NiMh.
You had better HOPE the circuitry has a timeout value, otherwise you'll
melt them down to a shapeless blob.
If nothing else, this will bring the life of your new NiMh's down.

Even float charging (which was routinely done in cheap equipment for
NiCads) is a bit iffy when you get to NiMH cells.