Having Said that they won't shut-off automatically. A voltmeter or hydrometer is required to check the battery ailment periodically and switch from the charger, once the batteries are completely billed. How can I Link a Battery Charger-Maintainer to My Vehicle? There's two approaches for connecting a charger-maintainer. The easiest is https://hukums.com/products/stanley-sxwt-ft520-pu-steel-hand-truck-with-120-kg-capacity