Check the battery as follows:
Battery exterior
Make sure that the battery terminals are not corroded and that there are no loose connections, cracks, or loose clamps.

Brake fluid
Before rechargingTransmitter battery
REPLACEMENT
1. REMOVE TRANSMITTER BATTERY
NOTICE:
Special caution should be taken when handling each component as they are precise
electronic components.
(a) Using a coin or equivalent, open the transmitter case.
NOTICE:
Do not forcibly apart the cover.
(b) Remove the discharged tra ...