BatteryMINDer® 1500 is a SmarTECHnology™ microprocessor controlled maintenance charger/desulfator. It is designed with 5-stages all automatic to ensure batteries are always fully charged and maintained at all times regardless of how long left during extended non-use – “off season” periods. Fully automatic Plug ‘n Run feature – means no buttons to push, all functions-stages take place automatically. Automatic high-low temperature compensator is installed to ensure that batteries will never be overcharged or undercharged, regardless of the operating temperature (0°F–130°F operating range.) The 1500 includes full-time automatic high frequency pulse desulfation (not high voltage), which helps extend the life of a battery up to four times over its normal life. Unit can maintain up to four 12 Volt batteries at one time when connected in parallel by using SmarTechnology™ Y-Connectors (part# 210AY) or customer supplied 18-Gauge insulated wire. Including but not limited to: Maintenance-free Flooded (filler cap) and sealed, Starter, Deep Cycle, Marine, and Hybrid. Not for use with aircraft batteries.