No charger at all, I mean charging the battery *directly*. I have done it
many times already, using 0.2V to 0.3V above its nominal 3.7V, for only a
few minutes. Current goes from 800mA to 400mA during these 2 to 4 minutes.
It charges the battery to an operational level (good for one or two more
days) and the battery doesn't even get warm. It remains really cold during
the whole charging process.

When I have my charger with me, I sometimes charge the battery for only a
few minutes and the phone works for 1 or 2 days after that. I assume my
charger does something very similar to this manual process in its first
minutes of charging.

If attended during the whole time and carefully done, this process helps in
an emergency. But, although it works, I understand it requires attention and
is far from ideal. That is why I addressed it to the list. 

Still doing it manually, is there a way to improve it?

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