When charging the DC-2 Pro please use a mains supply (5v 2a Output Plug).
Some dedicated fast charge specific phone chargers i.e. Samsung are not suitable and will not charge the camera. You can also use a powerbank.
The camera will not fully charge if you are not using the charging cable provided. The camera must also be charged via mains or a powerbank supply. The USB port on any computer or laptop will not provide the power required to fully charge the battery. If you are still having problems conduct a hard reset (button on camera, you will require a paperclip or similar) failing that conduct a firmware update explained on this support page. Note if you are using the GPS feature without a powerbank your battery consumption will reduce by appx 30%.
The battery lasts up to 4 hours when recording at 1080p, increasing the resolution of the recording, or cold weather can impact battery life.