I got a new 13000 mAh battery for my eee pc from ebay. On full charge it shows 10600 mAh full charge capacity while after some discharging (about 75% left right now) this figure is 12100 mAh. I have cycled the battery from 100% down to 20-30% about 5 times. Why is the full charge capacity different at different charge levels? Which figure is correct?