I went looking for info on rechargeable Lithium coin cells and found it very
hard to find anything technical.
Here's the best of my slim pickings.

Most of following sites are subset of this one with good source of battery
technical data including tables etc
        http://www.allbatteries.com

Sanyo ML series rechargeable Lithium Manganese coin cells
    http://www.allbatteries.com/sanyo19.htm

Varta MC series Lithium Ion coin cells
    www.allbatteries.com/vartrlbc.htm

Varta also do button cells in NiMH which have a much higher max
charge/discharge rate.
    www.allbatteries.com/nimhre24.htm

Maxell make them too (and sell them via eg Farnell 3031998 etc) but don't
seem to want to tell you about them on their various sites.
A bit at
    www.maxell.co.jp/eng/device/ml_bat/


Std Lithium coin cells - discharge curves. usefulish
    www.tbcl.co.jp/TB_e/lb_b_e.htm

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