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I think you’ll find that the temperature reading is the temperature of the battery. An unexpected rise in temperature whilst the battery is charging can be an indicator of a problem. Battery temp sensors are usually just a lead attached to one of the terminals, so quite feasible that what you have bought can do this. Many of the better chargers have temp sensors attached to the battery in this way, & adjust the charging voltage dependent upon the temperature. This helps to extend battery lifespan.
Out of interest can it tell you how many amps are going in or out at any one time?
Last edited by Cuppa; 22nd May 2017 at 07:49 PM.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)