BMS won't power on after charge?

Joined
Nov 3, 2016
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Just completed a battery upgrade (Tattu 5200). Everything seemed to go fine, but now after charging, the pack doesn't power on, or react to the button. I've tried plugging a different switch board in with the same result. Tested the voltage where the leads are soldered onto the BMS, and the pack is indeed full.

Any ideas?
 

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