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Old 11-13-2005, 09:35 AM
confusedscientist confusedscientist is offline
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Exclamation help me if you can!!!

Hi,
Thanks for viewing this. I am making a project on lead-acid batteries and i dont exactly know what is meant by "Ah" which is written on the batteries and if there is more "Ah" does the motor or something runs for a long time?

If there is a 12v 0.3A bulb how can we calculate that for how much time can it glow with a fully charged 12v 2Ah lead-acid battery?

Last edited by confusedscientist; 11-13-2005 at 09:43 AM..
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Old 11-13-2005, 08:25 PM
catwood catwood is offline
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Default Ah

a chance to use my knowledge from my fighting robot experiences!

AH means Amp-hours. all batteries (that i know about) are measured in Amp-hours or milliamp-hours, which are 1/1000th of an amp-hour. Ah refers to the capacity of the battery, so a 12 ah battery should power a motor for about twice as long as a 6 Ah battery. A 2 Ah battery is capable of putting out 2 amps for an hour or 4 amps for 1/2 hour or 1 amps for 2 hours etc.

The formula for battery power with an SLA is AH = ((I * T) / 60) * 1.6) where I = current draw, T = time in minutes and AH = amphours of battery so plug in your 2 ah battery and .3 amp lightbulb and solve for T. so your lightbulb should be able to be powered for 250 minutes or just over 4 hours.

hope this helps
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