Dismantle: Open the cover by pressing the hole with a little screwdriver. Loosen the battery holder. Assembly: Insert a new battery (CR1632), in the holder and press to fasten. Assemble the cover.
When a new battery is assembled the remote control has to be synchronized to the car.
Press remote unlock button at least 4 times. The car has to be within range. Turn indicators flash when synchronising is received.