In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

In the past year of so, I have seen that the NiMh AA cells are being sold with substantial increases in MAh, nearly 3000MAh.

It seems that there really is little reason to fool with Lithium unless you need the absolute minmums in weight or the quick recharge or both.
It is a very interest phenomina, teh Li battery is much denser in the amounts of enery that the more conventional batteries.
That energy density is what makes it potentially unstable.

It seems the solution is to make very thin cells of retangular sizes.  
This physical configuration seems to provide a package that will have a lot of room to swell rather than burst or explode.

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