Re: F cell NIMH batteries
- From: Roy Lewallen <w7el@xxxxxxxxx>
- Date: Wed, 04 Apr 2007 17:01:19 -0700
lyndonwaldner@xxxxxxxxx wrote:
> I'm wondering if it would be possible to charge a single F cell NIMH
> batttery in a normal AA NIMH charger if I set up an adapter to
> convert. I'm guessing it would need to go by voltage, but do smart
> chargers know the difference if the battery is a 2000mah or 10000mah?
> Would it stop charging to soon, or not stop at all, because I won't be
> able to use temp? Although the charger I'm planning on using Lacrosse
> BC-900 only uses temp for backup. (I think) How does a charger 'know'
> that a battery is fully charged?
>
> Thanks for your help.
NiMH chargers typically use a voltage change and/or temperature change to detect the end of charge. Both of these methods depend on a fairly high charge rate, typically 0.25C to C or so. Otherwise, the voltage and temperature changes are too small to reliably detect. Unless your charger is able to charge at those rates (which would be 2.5 - 10 amps for your 10 Ah cells), the charger is likely to miss the end of charge. There's some possibility that the charger won't detect the end of charge even at the low end of that current range. I'd check the charger specifications or contact the manufacturer to see what the highest recommended capacity cell is.
Roy Lewallen
.
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