[chbot] Resurrecting used 18650

[Peter Harris]

Hi Volker
You should find everything you need here: http://batteryuniversity.com/
When I was up to date on LiIon a few years ago the facts were:
Overcharging leads to explosions.
3V0 was the recommended end discharge voltage.
Cells below 2V5 have probably lost capacity permanently.
A low current (C/10) should be used to raise over discharged cells back to
the 3V0 threshold.

Things may have changed since then with new chemical mixes.
Always use a suitable pack protection circuit.

I have spoken at the club on the merits of undercharging LiIons, here is
the reference material:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

BFN
  Peter
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