Deerc 4wd 9310 high-speed RC truck is a blast to drive and easy to own with legendary durability, low-maintenance design, and unmatched parts support. 2 rechargeable batteries with TWO 7.4v 850mAh high capacity batteries and the USB charger, Long to last and fast to charge. It will extend the driving time up to 40+minutes which depends on the operation. 4 metal shocks are installed to absorb jumps and rough terrain, so the cross-country car body is more flexible and gains gra to maintain the stability condition of the battery, please remove it from the toy truck and turn off the truck when charging. A fully charged remote control battery needs to be replaced when the car cannot drive forward or backward, the indicator lights will blink slowly. Remove the remoter and car battery to ensure long-term use. The RC Car: When the vehicle cannot move forward if the light blinks slowly, it needs the full-charged battery replaced.