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'Re: selection of battery for power consumption '
| On a similar point, we are evaluating batteries from different
manufacturers as the moment for a battery powered application.
And we are discharging Ni-MH batteries down to 1.1V per cell, and seem
to be getting aound 80% capacity out of the cell when discharging at
1C ... does that sound reasonable?
For Ni-MH what volatge per cell do the manufacturers rate the mAh
capacity of the battery. or is this one of the tricks they play with
specs to make thier batteries look batter than the competition?
Does dicscharge rate affect the capacity of the battery to any great
thanks in advance,
______________________________ Reply Separator _________________________________
Subject: Re: selection of battery for power consumption of 300mA/hour
Author: pic microcontroller discussion list <MITVMA.MIT.EDU> at PICLIST
Date: 09/06/98 14:57
At 02:41 PM 8/06/98 -0700, you wrote:
I don't agree with the 75% of capacity, we get 100 to 115% consistntly, note
that the capacity tests are done with a light load! Not a huge 1AMP or
something like that. 0.8V is quite OK for most things, also note the
internal impedance of the cell at this voltage.
Dennis Plunkett: Embedded Hardware, Software design
NEC Australia DRMASS
ph 03 9264-3867
> And we are discharging Ni-MH batteries down to 1.1V per cell, and seem
> to be getting aound 80% capacity out of the cell when discharging at
> 1C ... does that sound reasonable?
A lot of other factors come into play, including temperature, charge type
(peak, timed, etc.)
You should get 80%-90% out of what you put in, as a rule of thumb. I put
2200-2300 mAH into a 2000 mAH cell, and get about 1980 out.
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
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