Posts: 27
Threads: 4
Joined: Jan 1970
NiMH cells will work fine any just about any trickle charged NiCD application without any modifications whatsoever. Because they have about twice the capacity of NiCD batteries their charge rate (in cell capacity/charge current) will be about half of the NiCDs and take twice as long to charge fully. This means they are also stressed about half of what a NiCD would be. A typical cell can stand an continuous trickle charge rate of C/10 without problems (although I prefer less). In these calculator applications the NiMH cells have a charge rate of around C/25 or less. I have used NiMH cells in EVERY trickle charge replacement I've done in the last three years without a single failure. NiMH cells do not have the "memory effect" problems of NiCDs and are more enviromentally friendly. In the past I have built some solar powered remote sensing applications that have run continuously for over 10 years without losing a single bit of data or had any maintenance(except when Bubba with his rifle decides to do some target practice) and am rather familiar with long term reliable operation of rechargeable batteries.