You have to replace the batteries.
Here is a link
that leads you to download the manual in english language for free. When you open the manual, you would see instructions on how to replace the batteries and the type of batteries which are compatible with your device.
Also, if you do not want to go to the manual, here is a step by step instruction on how the battery should be replaced.
1. Switch off your camera and open the battery/memory card chamber.(ensure that the power light and monitor have gone off before opening the chamber).
2. After opening the chamber, slide the orange battery latch upward and remove the battery using your hand.
3. Use the new battery to push or slide the orange latch upward and make sure that the positive and negative terminals of the battery are on the left and right side respectively(doing otherwise would damage your camera)
4. After pushing the battery in completely, the orange latch would lock into place and then you can close the battery/memory card chamber.
You should charge the new battery for a couple of hours before turning it on.
The device uses a rechargeable Li-ion battery EN-EL10.
If you need links on where you can purchase the batteries, you can comment here and i will send you some links.
Hope this solution was helpful? Please comment for more information. Thank you for using fixya.