> However, I believe that this
> minimum charge threshold is actually built into the battery control
> electronics rather than the battery itself.
Yes, it is.
> That is to say, If I could have bypassed the controller and charged it
> back up manually, I believe that I would have got some further use out
> of the battery.
This is not a safe thing to do; a deeply-discharged lithium cell is no
longer viable. Although you *might* manage to get some charge into it, you
also might have an incipient internal short. Given the energy density of a
lithium battery, that can lead to a fire...
Vic.
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