Burek on 11 October 2014
The battery really does last very little, but don't go spending extra money unnecessarily, it's a waste.
You do have about 6-8 hours of playing time, and you certainly won't play that much without breaks (you really shouldn't). You got a USB cable with it, so just use your port on the PS4 to charge it, or do what I do, and use your smartphone charger. It charges in less than 2 hours. Just get in the habit of plugging it in every couple of days between sessions, and you should never have problems with low battery.
