Such as the Moreover product, the Battery Tender Junior is a fully automatic battery charger by using a "float" feature that allows for it being remaining hooked up to the battery terminals, charging as it depletes and only as required. Some say the device can heat up quite a bit https://hukums.com/products/hukums-2-in-1-foldable-car-creeper-cum-stool-40-inch-for-workshop-mechanical-automobile-industry