This specific Charger/Starter is particularly excellent due to it’s applicability to three types of batteries. One of our vehicles happens to have an AMG battery vs a Standard battery. This Charger/Starter works with our AMG battery while others will not. During the recent (2019) Polar Vortex, our battery in a vehicle we seldom drive was completely dead. This product brought that battery back to life and saved us an expensive service appointment. The product was very easy to operate.