I bought this to charge a vehicle stored outdoor with an extension cable 25' from Schumacher that Amazon suggested. as frequently bought together..BUT  the charger  doesn't have a connector for the extension cord , just the  hardwire terminals.  Also the owners manual says do not expose to rain-  hard to thing of a rainier environment  than a vehicle driving at highway speeds in the rain and this is supposed to be  mounted under the hood, not totally out of the weather by any means. So I decided to put it on my tractor in the barn and  get an indooor charger from Schmacher for the outdoor vehicles