In article ,
Doug McLaren wrote:

| Most cheap rechargable appliances have a slow charger that charge the
| battery at around C/10.

Of course, since the original poster says it charges the batteries in
20 minutes, obviously it doesn't fall into this category.

It would be best to replace those batteries with similar batteries.

Modern NiMH cells will tolerate overcharge almost as well as NiCd
cells, but they don't like being charged at over 1C rates, except for
the sub-C cells which can go a bit higher, probably 2C.

As another poster suggested, if they're sub-C cells, get them at a
hobby store that sells R/C stuff. You can buy them online too easily
enough -- www.radicalrc.com is one of my favorite places.

Places like Batteries Plus probably have what you need too, but their
prices are generally quite high.

--
Doug McLaren,
"The wheel is spinning but the hamster is dead."