I know to store the batteries at 50% if they are going to be on the shelf for a few months. I am getting ready for a trip and took the batteries off the shelf to check them out and all 3 batteries only had about 15% charge. Is this normal after about 2.5 months? I will be leaving and the drive takes 1 day. Is it OK to charge all 3 batteries up to 100% so they will be ready to use when I get there after about 2 days?