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Battery Ahs. 20 Hr. rating

Discussion in 'Electronic Basics' started by hartly, Apr 8, 2005.

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  1. hartly

    hartly Guest

    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
     
  2. Lord Garth

    Lord Garth Guest

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

    A 12 volt lead / acid battery is dead when the potential falls to 10.5
    volts.
     
  3. 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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