Look at your cell #3. Unplug the battery, or at least the JST connector and manually measure the cells. If cell #3 is truly 0.8v then replace the battery. If cell #3 is more/less normal then RMA the board. While battery is out check the fuse. I hade one very similar, and the battery worked in another mod just fine. Mine looked like this and fuse was good, I RMAd the bard.