Tecmate Optimate 7 Select Battery Charger TM-251Perfect for starter and deep cycle 12V batteries that demand accurate temperature controlled charging and unsupervised safe long term maintenance Voltage selection (14. 4V 14. 7V) to ensure the battery receives charge at the correct voltage Power supply mode delivers stable power for vehicle system reprogramming, showroom vehicle demo or retaining memorized settings when battery cables are disconnected to fit powered accessories or replace the battery