Revo Starter Box II. Battery not Included. You can erither use two 7.2v flat pack batteries, or one 12v battery.

Using 7.2v Batteries

Step 1: Open side panel by removing the hex screws
Step 2: Place 7.2v batteries into brackets and connect
Step 3: Close Panel

Using 12v Battery

Step 1: Open side panel by removing the hex screws
Step 2: Remove brackets for 7.2v battery. Place double sided tape about 5mm from edge
Step3: Replace connectors for 7.2v battery and connect with wiring for 12v battery
Step 4: Remove the lower L bracket on side panel. Use other L bracket to secure battery.
Close panel.

To charge battery, connect charger to black and red battery terminals and turn on switch.