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Understanding AMP-HOUR Ratings of BatteriesFor example, if a battery has a 10 Amp-hour rating that means that the battery should provide a current 10 Amps for ONE [hour], or 1 Amp for 10 hours, or 5 Amps for 2 hours, or 2 1/2 Amps for 4 hours.

By using the Amp-hour rating, you can determine the "size" of battery needed by multiplying the current [Amps] you need to do a job, and how long [in hours] you need that current to be supplied before having to recharge the battery.

One caution however, Amp-hour ratings are not always 100% accurate, and you must be prepared to recharge more often if the battery does not actually produce that much power.

This problem usually manifests itself when the power is drawn out of the battery in huge amounts/rates rapidly. When a battery is discharged at a very slow rate in relation to its capacity, then the Amp-hour ratings are usually very accurate.

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