Honda EM3800SX Owner's Manual page 70

Battery Tray Kit (optional)
1. Follow the instructions that come with the battery tray kit and install
the kit on the generator frame.
2. Route the starter cable under the tank and connect it to the starter
solenoid.
3. Connect the ground cable to the generator rear housing.
4. Set the battery on the battery tray and secure with the battery
bracket.
Connect the starter cable to the battery positive ( ) terminal first,
then to the negative ( ) terminal. When disconnecting, disconnect
at the battery negative ( ) terminal first.
5. Install the battery guard plate on the battery guards.
Battery posts, terminals, and related accessories contain lead and
lead compounds. Wash hands after handling.
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