Battery runs down quick

This has sometimes been an issue with the V3. To insure it is not your usage of the phone, make sure bluetooth is not always on(it uses a lot of battery), make sure display lights are not on longer than actually needed, make sure you are not talking on the phone while charging it or pulling it off the charger before it is fully charged since either one will mess up the battery's memory and cause it to drain quickly. If you have went through those and the issue persists, batteries usually have some sort of warrenty in the first year of original purchase. If not aplicable, you might have to buy a new battery.