> Connect two lithiums cells in parallel and you'll double
> the lifetime.

It should more than double. Halving the current drain at
that end of the scale will give a better Ah rating per cell
than halving it at higher drains. That's been my experience
with other batteries (and as told to me by manufacturers
beforehand, although they don't seem to have charts to
prove it. What they do have is mostly for the middle range)

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