I've made the mistake of keeping my batteries charged 100% and storing them for months at a time. Flew the other day with my 100% charged battery then when it got down to around 60% I started getting battery low alert and the bird started to auto descend. See the photos of my batteries and the 1.08 assistant battery snapshot. I noticed one of the batteries has cell voltage of around 3770 while the other 3 have around 4170. Which battery is swollen and/or should be thrown in the recycle bin?