Directly charging over-discharged li-ion cells with my bench supply. Definitely nothing unsafe going on here.
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Replying to @marcan42
I directly charged a Ryobi 18V pack (it's just 5 18650s in series) with a lead-acid-battery charger the other day
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just needed a few seconds to get the pack voltage up above like 6V or so, at which point the charger accepts it again
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Replying to @11rcombs
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.
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I *think* 1.8V is still above the "it's gonna go boom if charged" range, but... we'll see.
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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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Eh, that's cutting it extremely close. I've had my share of old batteries turn into blimps in front of me, it's quite nerve-wracking. X3
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This tablet actually had a blimp inside until I realized both the slight display distortion *and* the poor battery life had the same cause.
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That was last year when I bought a replacement on eBay and got a fake, but the cells looked OKish so I reused them with the old PCB/frame.
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These are those cells :D
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