Key features

• •[DUAL PURPOSE]: The WEIZE BCI Group 31M is a dual purpose deep cycle sealed AGM marine and RV battery. It features an outstanding starting power and deep cycling capability for long-lasting power supply. Terminal： Left : Positive (+)-Red, Right: Negative (-)-Black.
• •[HIGH PERFORMANCE]: Powered by advanced AGM technology, the WEIZE BCI Group 31M has a low internal resistance and high output power, offering a reliable power supply and a long battery life, 2x more cycle life than traditional flooded marine batteries.
• •[QUICK CHARGE]: The WEIZE BCI Group 31M features quick charging, which allows it to charge up to five times faster, saving time and increasing efficiency. Please use a constant voltage of 14.4± 0.1V and a max current of 21A to charge the battery until the current has no change for 2 to 3 hours， But the maximum charging time must not exceed 24 hours.
• •[LOW MAINTENANCE]: Being almost maintenance-free, the WEIZE BCI Group 31M reduces surface corrosion, proves more durable, and performs well against vibrations, has 20x more vibration resistance than flooded batteries.
• •[SAFETY]: With a leak proof design and the presence of specialized valves, the WEIZE BCI Group 31M battery is very safe to use, ensuring a longer battery life. WEIZE dual-purpose Batteries are confidently guaranteed for 2 years! We aim for quality followed up with quality customer service, Amazon doesn't deal with the return of battery-related products, so please contact the seller directly. Weize support team is on standby for YOU.