This wheel charger by Associated charges 6V and 12V batteries. It can charge 12V at either 10 amp or 40 amp and charge 6V batteries at 40 amp. It also features a 200 amp 12V cranking assist. This charger is popular with small shop owners and "Do-It-Yourself" type users. The charge time dial go up to 90 minutes with HOLD. The Associated US20 is durable and made to be safe in any weather.