I just got the Hyperion 550mAh battery as part of the gremlin kit from flitetest. I am fairly experienced building quads and check for continuity, due diligence etc. I charged the battery, plugged it into the quad for the first time, and got no response from the escs. Upon unplugging the battery I noticed it had severely puffed and checked its voltage with a multi meter. I get no voltage out of it on the main battery leads. Additionally, on the balance connector one of the cells gives 4 volts while the other gives no value. When I plug the battery into my charger now, (turnigy accucell 6) it almost immediately gives an error for "ext. temp too high". I've since gone over the gremlin and double checked for shorts and I can't find an issue, the femto FC/pdb still works on my pc connecting to betaflight too.
So my question is to people with more experience with battery failures, is this just a faulty cell or battery?
So my question is to people with more experience with battery failures, is this just a faulty cell or battery?