Then, you'll connect the charger's favourable clamp towards the battery's beneficial terminal as well as the charger's damaging clamp for the battery's destructive terminal. Normally, the charger's good clamp will be purple and the damaging clamp will be black. Nonetheless, this charger is a little less expensive compared to GENIUS10, https://hukums.com/products/elak-automotive-battery-chargers-c-624