This charger will not turn off on its own. You must manually unplug it to avoid "boiling" the battery or causing a fire.
: Lead-acid, AGM, Gel, and Liquid Electrolyte (SLI)
Disclaimer: Always follow the specific instructions written on the back of your physical charger. Using old equipment carries risks; inspect wires for cracks before each use.
If you are looking for the manual, the operation is straightforward: Connect Clamps: Attach the Red (+) clamp first, then the Black (-) clamp to the battery terminals. Plug the unit into a 230V wall socket. Select Mode:
If your battery has removable caps, unscrew them to allow gases to escape during charging.