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Subject: Re: Questions on building a battery charger
Date: Tue, 26 Nov 2002 14:34:10 +0000 (UTC)
NNTP-Posting-Date: Tue, 26 Nov 2002 14:34:10 +0000 (UTC)
User-Agent: tin/1.5.14-20020926 ("Soil") (UNIX) (Linux/2.4.19 (i686))
Terry King wrote:
>> Assuming the MAX712 has delta-vee shutoff, then if charging at a four
>> hour rate, C*.35 sounds about right for getting them fully charged.
> Can someone point to some good NiMh battery specs from Manufacturers?
> I seem to mainly end up at sites with oriental character sets.. I
> really am looking for detailled info on charging variations.
> I have a computer-based battery charger/tester I built, driven by
> an old PC (So it takes up some bench space!). I have a little language
> to control sequencing and termination conditions of any charge or
> discharge or float step. Is there any advantage in call life / charge
> cycle life to doing some multi-step charge? Now, I often do 1.0C until
> a voltage termination, .25C to a voltage, .1C to a negative delta-V, and
> then some ?? trickle charge value. I can log I and V over time (Going to
> do temperature soon), so if I really knew what to look for I could
> probably figure quite a bit out...
Ah, I remember a name.
I believe http://www.powerstream.com/ have some invaluable datasheets on
general battery charging.
If I've got the URL wrong search on sci.electrochem.battery.
Trickle charging NiMh cells is not something they really like.
It's probably better to hit them with a C/10 pulse every few hours.
If you really care about cycle life, NiCd seem to be quite a bit better.
http://inquisitor.i.am/ | mailto:email@example.com | Ian Stirling.
Things a surgeon should never say:
Better save that for the autopsy.
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