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Battery Ahs. 20 Hr. rating

H

hartly

Jan 1, 1970
0
Why does it say '4 Amp-hrs.(20 hour rate)' on a battery?.
I know it means it can give out 1 amp. for 4 hours.
But does 20 hr.rate mean that in reality it can only give out 0.2
amps.for 20 hours(making 0.2x20=4Ah.)?.
Thanks, Hartly
 
L

Lord Garth

Jan 1, 1970
0
hartly said:
Why does it say '4 Amp-hrs.(20 hour rate)' on a battery?.
I know it means it can give out 1 amp. for 4 hours.
But does 20 hr.rate mean that in reality it can only give out 0.2
amps.for 20 hours(making 0.2x20=4Ah.)?.
Thanks, Hartly

You are correct ... 4AH/20H=.2A

A 12 volt lead / acid battery is dead when the potential falls to 10.5
volts.
 
P

Peter Bennett

Jan 1, 1970
0
Why does it say '4 Amp-hrs.(20 hour rate)' on a battery?.
I know it means it can give out 1 amp. for 4 hours.
But does 20 hr.rate mean that in reality it can only give out 0.2
amps.for 20 hours(making 0.2x20=4Ah.)?.
Thanks, Hartly

It means that the ampere-hour rating is based on discharging the
battery over a period of 20 hours (this is, I think, the most common
way to determine AH ratings)

If the battery is discharged at a higher rate, you will get less total
energy out of it. For example, if you discharge it at 0.4A, you might
only get 3.8 AH.
 
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