Directly charging over-discharged li-ion cells with my bench supply. Definitely nothing unsafe going on here.
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Yeah. 3.7V tablet battery, bypassed protection, couple mins at 100mA brought it from 1.8V to 2.7V and now it's happily charging.
I *think* 1.8V is still above the "it's gonna go boom if charged" range, but... we'll see.
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Just a few minutes later on normal USB charging it's up to 3.7V. That doesn't quite sound right... the cells might be damaged. Meh.
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Might actually be normal-ish though. Charge voltage plots do show 3.7V as a typical "depleted" initial charging voltage.
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2.5V is the lowest I'll let one go. Beyond that it hits the bin.
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It varies by manufacturer, but the numbers I read are in the 1.5V to 1V range. Though of course you have to slow charge up to ~2.5V.
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