Having Said that they won't shut-off automatically. A voltmeter or hydrometer is required to examine the battery affliction periodically and switch off the charger, after the batteries are fully billed. The one.25 amps of power delivered makes sure a "very low and sluggish" charge, which is best for the health https://hukums.com/products/stanley-sxwt-ft516-pdq-light-weight-hand-trucks