Battery Tender 4-Bank Charger: Multi-Stage 1.25A per bank Intelligent Battery Maintenance System

The engineering logic of the Battery Tender 4-Bank Charger centers on its microprocessor-controlled 4-stage charging sequence. During the initial 'Bulk' phase, the charger provides a constant current of 1.25A per bank until the 12V battery reaches approximately 80% of its capacity. It then transitions to the 'Absorption' stage, where the voltage is held constant while the current tapers off to ensure a 100% state of charge without overheating the lead-acid, AGM, or Gel internal components. A critical technical advantage is the 60W power distribution system, which prevents voltage sag when all four banks are under full load. The 'Equalization' or desulfation phase utilizes high-frequency pulse modulation to dissolve sulfate crystals, a feature essential for batteries in the 5-100Ah range that have experienced deep discharge cycles. Furthermore, the trickle charge mode maintains the float voltage indefinitely, compensating for self-discharge rates common in seasonal vehicles. The metal chassis serves as a passive heat sink, ensuring that the 1.25A output remains stable across a wide operating temperature range without the need for noisy mechanical fans.