Great high performance marine battery. Renogy Deep Cycle Hybrid GEL Batteries, made of materials of the highest quality, keep the monthly self-discharge rate at 77°F (25°C) below 3%. Since this battery is made of gel rather than liquid, no upkeep is necessary to keep it functioning correctly. Renogy Deep Cycle Hybrid GEL Batteries may be utilized almost everywhere due to its maintenance-free nature, lack of leakage, lack of hazardous gas production, vibration resistance, and steady performance at both hot (140°F) and cold (-4°F) temperatures. PROS🟢 Suitable for marine, RV, van, off-grid, and home backup Powerful Deep Cycle Hybrid GEL Batteries for a longer life cycle CONS🔴 Charging may take a long time