My 2 years old LG Optimus L7 used to run out of battery half day and only lasted one hour of screen time, then I invest in the extended battery for it. I think with the new battery it'll last all day even actively played games throughout the day, or use it as a wifi hotspot. I love my L7 again thank's to the new battery off MPJ. It lasts two days when the phone is at normal usage. If you have a problem like I have had with the stock battery just tried a new battery.