I fully charge my laptop's battery and when I hover over the battery symbol on the toolbar it tells me it is 100%. Then shortly afterwards, about 1 minute later, it tells me there is 4 minutes of battery power left! If I do not charge it quick enough it turns off. It is a brand new laptop which I got 16 months ago and up until 2 months ago the battery was perfectly normal. It is used almost every day for 1-2 hours and is charged regularly when needed.