Remote Control Battery
It comes with a replaceable CR123A battery (also might be called A123) which can be purchased anywhere batteries are sold.
The battery should last a year or more! Similar to the battery in your TV remote.
They look like a short double A battery. Image shows examples of the CR123A battery.
Note: erratic behavior has been reported when using off-brand batteries in the remote.
Caution - we do not recommend using rechargeable batteries in the remote controller.