Time for a new charger, I just measured all the batts I've charged since last night and they're coming off the charger at well over 4.5v, both LiMn and protected Li-ions. Turns out the 17w I thought I was vaping today was actually 23w, lol. 
Edit: Scratch that, multimeter batt is just dying.

Edit: Scratch that, multimeter batt is just dying.
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