The Monster Marine Lithium 12V 40Ah Viper Battery is the ultimate lightweight power solution for 12V electronics, kayaks, and outdoor adventures. Weighing only 11.5 lbs, this battery is built with Lithium Iron Phosphate (LiFePO4) technology, offering twice the power, 60% less weight, and a lifespan 4 times longer than sealed lead-acid batteries. Featuring Bluetooth monitoring via an iOS and Android app, you can track performance and battery status with ease. Installation is simple and plug-and-play, with the ability to wire up to 4 batteries in series. Ideal for ice fishing setups and compatible with a variety of AGM chargers.

SPECIFICATIONS

WARRANTY

WEIGHT

11.5lbs

SIZE

7.5″ (L) x 5” (W) x 6.5” (H)

STORAGE CAPACITY

40 ampere hours (Ah). Monster Marine Lithium batteries deliver reliable, consistent power throughout the full 40Ah capacity. Unlike traditional SLA batteries, Monster Marine Lithium LiFePO4 batteries feature a flat voltage curve, ensuring steady power output as they discharge. This advanced design provides uniform performance, giving you dependable energy all the way to the last drop.

Bluetooth Capable

Yes

VOLTAGE

12.8V 

ENERGY

512 Wh

TERMINALS

M6 Bolt

LIFECYCLES (BATTERY LIFESPAN)

Retains up to 80% capacity for 5,000 cycles under recommended conditions—far surpassing the 500 cycles of typical SLA batteries. Monster Marine Lithium batteries deliver exceptional longevity, reducing the cost per use to a fraction of traditional battery options.

OPERATING TEMPERATURE

Built for rugged and extreme conditions, Monster Marine Lithium batteries outperform SLA and other lithium options. With an optimal operating range from -20°F to +140°F and reliable performance down to -20°F, these batteries are designed to thrive in tough environments. Note: For best results, avoid charging below 32°F

DISCHARGE

40A max continuous discharge. The flat discharge voltage curve provides a 75% bigger capacity then a SLA 50Ah battery.

CHARGE

20a max, 14.4V recommended, 15V max Please note: this battery should be charged using a LiFePO4 compatible charger. A SLA charger may work, but will reduce performance and lifespan of the battery.

INCLUDES ACTIVE BMS PROTECTION

Equipped with an advanced circuit, this battery ensures cell balancing, low and high voltage cutoff, short circuit protection, and high-temperature protection. These features boost performance and significantly extend the battery's lifespan.

Unlock the Monster Marine Lithium Advantage

The Monster Marine Lithium 12V 40Ah Battery delivers lightweight, Bluetooth-enabled power with LiFePO4 technology, perfect for outdoor and portable applications.

USD : 75.0