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I have a device that uses a pair of 1.2 volt NiMH rechargeable AAA batteries at 550 mAh (Philips HB550L).

Would it be harmful at all to replace these batteries with rechareable 1.2 volt AAA Duracells (or other brand) at 800 mAh or even 13000 mAh? Would it be safe, would it affect longevity of the device or batteries?

Are there other considerations when using higher amperage batteries?

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  • \$\begingroup\$ That's capacity, not "amperage". \$\endgroup\$ – Ignacio Vazquez-Abrams May 10 '14 at 2:06
  • \$\begingroup\$ @IgnacioVazquez-Abrams I do not pretend to know what I'm talking about ;) Please feel free to edit the question in any way that makes sense. Also if it's a dumb question that already has an answer please point me to it. \$\endgroup\$ – Sébastien May 10 '14 at 2:08
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    \$\begingroup\$ possible duplicate: electronics.stackexchange.com/questions/100981/… \$\endgroup\$ – Nick Alexeev May 10 '14 at 3:13
  • \$\begingroup\$ @NickAlexeev Yes my question is definitely a duplicate. Because I was not looking for the word "capacity" I did not find the question you point at. \$\endgroup\$ – Sébastien May 10 '14 at 3:35
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The unit "mAh" is not amperage but is, instead, electric charge (the product of electric current and time).

Further, the product of the battery's voltage and the electric charge rating is the amount of energy the fully charged battery can (ideally) supply.

In short, using batteries with extra energy capacity will not harm your device, but would, instead, power the device for a longer time (all other considerations unchanged).

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  • \$\begingroup\$ Internal resistance being one of the important other considerations, particularly in cheap devices. \$\endgroup\$ – Ignacio Vazquez-Abrams May 10 '14 at 3:18
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To avoid confusion, I would like to add to the first answer that the voltage of the new battery must be the same even though the capacity or amp hours can be increased. In other words, don't change out your nimh battery with a li-ion which could give you an even higher capacity, but at a much higher voltage.

Voltage must stay the same!

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