If I remember correctly it's the voltage you need to watch out for, not the increased mAh rating. I remember buying an upgraded life battery for my digital camera and noticed that to go from 1500 mAh to 2000 mAh also included an increase from 7.2 to 7.4V. Apparently a mild increase in volts is okay, but I'm not smart enough with electrical engineering to tell you for sure. Maybe Marlin will chime in, or you could do a little research on the internet?