increase battery backup in lenovo g510

[nekyriyana]

lenovo g510 10 months old ,battery backup is decreased to 1.5 hours .what should i do to increase battery backup or any alternative (i have about 1 month under warranty period)????
pleazz anybody help.

 

[Warukyure]

Drain your battery all the way to 0, then let it fully charge to max again. Try that.