nimh batteries [RE-wrenches]

[Doug Pratt]

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Hi Jay,

I was using everybody's favorite device for running down AA batteries...a
MiniMag flashlight...actually a whole fleet of them with genuine Mag
Industries replacement bulbs (lots of them!). They draw about 280-290 mA.
And they wear out a bulb just about once every 3 to 4 discharge cycles, or
about 20-25 hours.
-Doug

-----Original Message-----
From: Jay Peltz, Peltz Power [mailto:jay at asis.com] 
Sent: Monday, February 28, 2005 9:48 PM
To: RE-wrenches at topica.com
Subject: Re: nimh batteries [RE-wrenches]

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Hi Doug,

With lead acid anyway, the capacity is based on rate of discharge.

I was making the same assumption with the NiMH.  Therefore the capacity is
going to be tested at some rate of discharge.

Since in your tests you recorded pretty much what they were rated at, what
rate of discharge were you using?

Thanks,
jay

> Rate? As in how fast can you discharge it?
> Or Capacity, as in how many milli-amp hours will it deliver?
>
> The capacity is printed right on every rechargeable battery, and that's
all
> I tested. If I drew a known number of milli-amps, how many hours till the
> voltage dropped under 1.0v.
>
> The rate usually isn't listed, although some rechargeables list a maximum
> charging rate. It's a pretty safe bet that you shouldn't take it out much
> faster than you can put it in. The rate varies with size, but if memory
> serves me, most AA size cells don't appreciate more than 500-600 mA.
>
> Was your answer there?
> -Doug
>

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