Acer TravelMate 290 / 2350 / 2450 battery
Aspire 3100 / 3650 / 5100 / 5620

It is recommended that you fully charge(generally recommend an overnight charge) and discharge the new ACER TRAVELMATE 290 SERIES Battery two to four times to allow it to reach its maximum rated capacity. It is normal for a battery to become warm to the touch during charging and discharging.