AAA 650mAh rechargeable batteries to be replaced by 850mAh or even 950mAh?

Yes, you can use higher capacity batteries.

They will take a bit longer to reach full charge, but equally will last longer off charge.

NiCd (Nickel-Cadmium) and NiMH (Nickel-Metal Hydride) have fairly similar characteristics and are interchangeable in many applications.

Some old NiCd-only devices or chargers may not sense when NiMH batteries reach full charge, and they can overheat.

If you swap to NiMH in the phone, keep an eye on it for the first couple of days and make sure the batteries are not getting hot.


Either type can generally stand overcharging at a charge current under 1/10th it's mAH rating just about forever (eg. a 950mAH can stand up 95 mA long term without damage), so charging circuits are not too critical.

I've used 2000mAH NiMH cells in phones that came with 650mAH Nicads (AAs) without any problems.


Li-Ion are a very different technology which has a far higher cell voltage. One Li-Ion cell is roughly equivalent to three NiCd or NiMH cells in series.

They are also far more critical on charging, any overcharging can cause them to burst so they need very specific and accurate charging electronics.

Yes, you can use A higher capacity (ma.) battery, as long as it fits in your phone.. (I bring mine to Radio Shack, they have most replacement batteries.).. As long as the voltage of the battery is the same. Do not get Ni Cad batteries, as they develop a memory, and are not used much anymore. Use Lithium Ion or Ni MH (Nickel Metal Hydride) batteries. Only the Ni Cad has a bad memory problem..

there are multiple this kind accessible on digital shops, or maybe handy shops. A replace won't unavoidably be 850mAh, a larger one like 1200mAH is plenty extra advantageous.