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Old 04-21-2006, 06:40 PM   #1
Cjchaps
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Default How do you tell when a 12 Volt 20 Amp battery is going bad?

I have a robomower and it takes two 12 Volt 20 Amp batteries. Do you measure the volts or amps or both to tell when it is going bad? I measured the volts with my multimeter and they both come up about 13.5 Volts and I couldn't test the amps because my multimeter only measures up to 10 amps...
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Old 04-21-2006, 06:41 PM   #2
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When it slaps you and takes your wallet.
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Old 04-21-2006, 06:42 PM   #3
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stick your tongue across the terminals. if you get a little tingle it's okay.
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Old 04-21-2006, 06:51 PM   #4
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check if it tastes funny
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Old 04-21-2006, 06:54 PM   #5
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I already did that when I stuck my tongue on it

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check if it tastes funny
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Old 04-21-2006, 07:02 PM   #6
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Quote:
Originally Posted by Cjchaps
I have a robomower and it takes two 12 Volt 20 Amp batteries. Do you measure the volts or amps or both to tell when it is going bad? I measured the volts with my multimeter and they both come up about 13.5 Volts and I couldn't test the amps because my multimeter only measures up to 10 amps...
Don't try to measure amps directly with your multimeter... you need a load. Did you maybe mean 20 Ah instead of amps?

Anyway, you typically measure voltage to test a battery.
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Old 04-21-2006, 07:26 PM   #7
Master2192
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Quote:
Originally Posted by BJamerican
Don't try to measure amps directly with your multimeter... you need a load. Did you maybe mean 20 Ah instead of amps?

Anyway, you typically measure voltage to test a battery.
Unless your testing a car/truck sized battery. Its a combination of reading the voltage and testing the amps. Only a true battery tester can put a load on a battery and measure the amps.

I've tested batteries here at work that put out 12v but tested at zero amps.
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Old 04-21-2006, 08:22 PM   #8
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Voltage is the ability for electrons to flow from the anode to the cathode...

The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power(represented as one joule of energy per coulomb of charge, J/C).

An ampere is a base unit of electric current equal to one coulomb per second.
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Old 04-21-2006, 08:33 PM   #9
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Take it to Autozone and ask them to test it for you.
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Old 04-21-2006, 10:28 PM   #10
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Old 04-21-2006, 10:30 PM   #11
Cjchaps
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What is the difference between an amp and an Ah?

It's Amp hours right?

Quote:
Originally Posted by BJamerican
Don't try to measure amps directly with your multimeter... you need a load. Did you maybe mean 20 Ah instead of amps?

Anyway, you typically measure voltage to test a battery.
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