This should be the last portable battery charger you ever buy and it's Waterproof! Temperature sensor included with purchase of the charger.
* Flooded (filler caps), maintenance-free sealed AGM and Gel.** U.S. Patented*** When compared to non at the battery temperature compensated chargers or ambient sensing types. **** Requires registration of product within 10 days of date of purchase and is non-transferable.