This is a good comparison (http://www.greenbatteries.com/li-ion-battery-faq/). The "AA" size of lithium ion are actually a little bigger size called CRV3. They won't fit in a slot designed for AA.

bp
<part15sbs{at}gmail{dot}com>

On 7/7/2016 5:44 PM, Jason McKemie wrote:
I thought I saw some rechargeable 1.2v cells at the store the other day. Maybe not.

On Thursday, July 7, 2016, Bill Prince <[email protected] <mailto:[email protected]>> wrote:

    Careful. There are rechargeable Lithium Ion (3.7 volt), and
    non-rechargeable "lithium" batteries (1.2 volt). Not the same.

    You can recharge the 3.7 volt ones, but AFAIK, the 1.2 volt ones
    are not rechargeable.


    bp
    <part15sbs{at}gmail{dot}com>

    On 7/7/2016 4:09 PM, Jason McKemie wrote:

        I've got a few older Siemens Gigaset phones that have
        rechargeable AA NiMH batteries.  NiMH isn't terribly easy to
        come by locally, is it going to be a bad idea to use
        rechargeable Lithium Ion AA cells instead?



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