help How to update bios. Acer has released bios1.9v Aspire e5 473g 553u

bios update Aspire e5 473g

help!! My acer has not been giving me enough juice to support 5/6 hours of backup in a single charge its only gives around 3 to 4 hours that also in low power mode. So i went to acer support center webpage acer aspire e5 473g 553u there they have released the updated bios claiming that it can improve the battery problem for the given Models

How to update it and can it improve my condition or even worse is comming....