Lets face it. The PS4 Dualshock 4 battery life drain out so fast. Unlike the Dualshock 3, where it can last for the whole day I believe. However, the PS4 Dualshock 4 controller has a light bar that is constantly on, this explains why the battery life never last long enough.
The battery in the DualShock 4 is a 3.65V 1000mAh battery and it can be replaced with aftermarket DS3 batteries. The user bought a 3.7V 1800 mAh battery, which cost him under $9 from Amazon, and he claims that the new battery life for DS4 double the regular one, approximately 14 hours of gameplay versus 8.