We buy used Volt ,Bolt (not many avail) and SPARK EV battery packs. They are great for use in a conversion EV. The cooling system is easy to hook up and use in the conversion. This will give them a very long life. We also reconfigure the power connections between cells and use these battery packs as Solar PV battery back up. They are smaller, have more power and last longer that old 100 year old toxic lead acid batteries. Thanks you Chevy for some great batteries.