when the battery is low, restart the laptop in the bios setting mode (without starting the windows). Now let the battery discharge completely until the laptop shuts off. Now restart and charge the battery. if possible, repeat the whole process all over again and then recharge the battery. This may help recover the battery and will give you longer time on a single charge.
Another AZB's ghetto trick.
AZB
Another AZB's ghetto trick.
AZB