Having Said that they will not shut-off automatically. A voltmeter or hydrometer is necessary to check the battery condition periodically and change from the charger, after the batteries are fully charged. 8 away from five stars on Amazon, making it overwhelmingly endorsed by whoever has purchased and employed it -- https://hukums.com/products/elephant-gbj-02-25mm-trolley-jackgear-box-jack-785-mm-maximum-height