Brand deep cycle AGM (Absorbent Glass Mat) battery, model PT18-12. Voltage and Capacity: It is a 12-volt battery with an 18Ah capacity. Technology: AGM batteries are sealed, maintenance-free, and spill-proof, using glass fiber mats to hold the electrolyte. Charging Specifications: Requires a constant voltage charge, with cycle ~14.8V and standby ~13.8V (at 25°C). Safety Notes: The casing warns against incineration, shorting terminals, or charging in a gas-tight container.