Question about Sony AA Nimh 2500 Mah Rechargeable Battery

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How long should i charge my 2500mah batteries for the firs time??? How long should be for 1350mah??? How long should be after first time???

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The first charge is - as you suspect - longer than the normal charge in order to "wake up" a battery that may have been on the shelf for a considerable time since manufacture. Typically 30 hours for the 2500mah batteries and 16 hours for the 1350mah.

I assume that your charger charges at a rate of 140 to 160 mA. This info is usually printed on the charger itself. (Quick chargers is a different story and the chargers are usually intelligent and can regulate the charging electronically.)

If your charger charges at a rate different to the typical 140/160mA, then increase or decrease the time for charging accordingly, i.e. reduce the charge time if the charge rate is higher. A good and safe test would be to check the batteries from time to time for heating. Stop the charging as soon as you find that the batteries are heating to anything warmer than a mild temperature rise.

Posted on Jan 18, 2011

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