However they won't shut-off automatically. A voltmeter or hydrometer is required to examine the battery problem periodically and swap off the charger, once the batteries are fully billed. buttons: a person to select the demand method, and One more to initiate charging. We experienced minimal problem attaching the TOPDON on https://hukums.com/products/esab-arc-200i-igbt-single-phase-portable-200a-mma-inverter-welding-machine