mAh rating for standard alkaline cell ?
08-07-2004, 11:41 AM
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mAh rating for standard alkaline cell ?
Does anyone have any data on the mAh capacity for a standard 1.5V alkaline cell ? I'll be discharging a cell on my accucyle to get an estimate. Has anyone done this measurement ? Please share your data. Thx !
08-07-2004, 12:17 PM
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RE: mAh rating for standard alkaline cell ?
The primary cell makers do not follow the same parameters as is used to test NiCD's. They often use VERY low discharge currents (25mA) and a 0.8V cutoff.
Here is a typical AA cell. Rated at 2700mAH using 25mA discharge: http://data.energizer.com/datasheets...ready/a91b.PDF
Here is a typical AA cell. Rated at 2700mAH using 25mA discharge: http://data.energizer.com/datasheets...ready/a91b.PDF
08-08-2004, 05:35 AM
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RE: mAh rating for standard alkaline cell ?
Your test shows a couple of the problems of using alkalines.
1) The effective capacity drops a lot if you discharge at a high rate.
2) The voltage drop as a function of remaining capacity and/or draw rate is much higher than NiMH or NiCd.
The discharge curve places a significant proportion of the cell rating below one volt where the effective power may be too low to run some equipment properly.
Ross
1) The effective capacity drops a lot if you discharge at a high rate.
2) The voltage drop as a function of remaining capacity and/or draw rate is much higher than NiMH or NiCd.
The discharge curve places a significant proportion of the cell rating below one volt where the effective power may be too low to run some equipment properly.
Ross
08-08-2004, 10:26 AM
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RE: mAh rating for standard alkaline cell ?
No discharge curves, but some interesting info here (tested capacity of AA NiMh and Alkaline cells in DIgital Camera apps):
http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM
http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM
08-08-2004, 12:18 PM
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RE: mAh rating for standard alkaline cell ?
It will be great if the discharge curve is available
08-08-2004, 10:07 PM
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RE: mAh rating for standard alkaline cell ?
I use rayovac rechargeable alks and I remember correctly they ran about 360 mah for the AA
Can't quite remember the specs and cutt-off though.
Can't quite remember the specs and cutt-off though.
