Hellbender

My Vaporshark dna200 just randomly stopped charging. I purchased the device in October 2015, had the board and battery replaced in June and again in September 2016 due to a blown fuse. In December the screen went out, VS offered to fix it again under warranty but everything was still working besides the screen so I decided not to send it back in until something else broke. 10 months later it was still working fine until yesterday when it quit holding a charge. Unplugged after it was charging all night expecting to be at 100% but the battery died after a few puffs. Connected to Escribe, each cell was around 3.6v and slightly unbalanced. Very slowly balanced and charged up to 3.73v per cell after 8+ hours but wouldn't go any higher. USB voltage was fluctuating around 4.25v and current was only 0.01a so I went out and purchased 2 new USB cables but got the exact same numbers. Voltage would show closer to 4.7v for a second then drop to 4.25-4.75v and USB current won't go above .03a I tried firing at 3.73v per cell while watching Device Manager and cell 3 sagged .1-.3v lower than the others, going as low as 3.05v under load. After firing the pack returned to around 3.6v cell 1 & 2 but 3.56v in cell 3. Again slowly balanced to 3.63v per cell and wouldn't go any higher. Tried firing again with the same results but now its sitting at 3.49v per cell and gradually draining while connected to Escribe. Would it be the battery or board causing this? I can't afford to replace both right now and this is my only device so would appreciate any advice. tl;dr vs200 won't charge above 3.6-3.7v per cell at .01a using multiple USB cords, cell 3 sags while firing. Running 1.2 SP5