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Down to zero... wow. Unfortunately, you must have done only a few minutes of research. That was briefly all the rage a couple years ago until packs started crapping out.
Given the voltage response, Stubby is probably right. Pack is done for. You took the marginal cell(s) and just drove a nail through their coffin.
It should have shot above 150V in just a few hours of charging, and cold actually causes significant voltage increase. In most cases, a successful discharge results in a higher voltage the second time around.
Note that given the inefficiencies of charging at low current and low temperature, you may need 32 hours of charging to ensure you are at true 100%.
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