i had the exact same problem with my therion 166 (DNA250) about 10 hours ago. cell 1 reading 0.01v and cell 2 reading 5.32v although both my batteries (also HG2's) clocked at 4.2v with a multimeter . what i did is i opened the device tampered with it and at the end i fried the board. any how what i noticed is the DNA chip is designed for 3 cells and when used with 2 battery devices they actually attach a 3 resistors between the + and - leads and the balance connector to trick the board that a 3rd battery is connected (3cell). what happen is when you connect your usb for charging or escribing the generated heat damage those resistors. that what happened to me immediately after i connected to escribe. and here is where evolv warranty and customer service shines. although i tampered and voided my warranty. i contacted CHAD from evolv and he agreed to replace the board free of charge. my advise is save your self the headache and contact evolv. all the best.