bob b:
>> And remember that nimh lose 10% of their charge per day on average.

roman:
>Is this really true?

it is apparently a topic of hot debate. i had heard (see link below) that NiMH self discharge is
only about twice that of NiCd, and more like 2% per day in typical conditions.

http://www.cliffshade.com/dpfwiw/batteries.htm

if you are the type to want something closer to fact than opinion then check out this graph to see
how self discharge varies with temperature:
http://www.duracell.com/OEM/Rechargeable/Nickel/selfdis.html

and this one to see how NiMH stacks up against NiCd:
http://www.bti.ca/selfdis.htm

[google search: http://www.google.com/search?q=nimh+self+discharge ]


so how occasionally do you use them ?

could be that a trickle charger would suit your application - negligable memory effect with NiMH (
unlike NiCd):
http://www.duracell.com/OEM/Rechargeable/Nickel/voltdep.html

and they are kinder to the environment, which can't be a bad thing.


Regards,
Simon

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.