One mini 2 battery out of 3 allows only max charge to 50% (two indicator lights.) Since used in only 9 outings I do not understand why it will not fully charge. However, as a sidebar, In a long conversation lasting about 15-20 minutes, I neglected to protect batteries from the sun and the result is they got warm to the touch. So My question is could this battery have been affected such that it will not take a full charge? As a sidebar, After I return from an outing I charge batteries to 100% and place them on a tray for auto discharge. When I am ready to go out I check the status of my batteries and recharge for the outing. I also have a notepad to record the status of batteries by dates so that the batteries will not discharge less than 20 to 30%.