A constructed-in cost controller prevents overcharging; charging stops every time a battery is topped off and automatically resumes when the battery is drained. Having said that, this charger is a little much less expensive compared to the GENIUS10, so if you’re thinking about that being a value issue, this a https://hukums.com/products/stanley-70-370e-double-ended-open-jaw-crv-spanner-14x15-mm-pack-of-10pcs-4