Exotronic 12V 200Ah Guardian Series Smart Deep Cycle Sodium Ion Battery with Bluetooth and On/Off Button 200Ah Guardian Series Expansive Features Include: Next-Gen Sodium Ion Technology Sleek, Space-Saving Profile Real Time Bluetooth Monitoring IP66 Water Resistance and Dustproof On/Off Button JK BMS with 2A Active Balancer Pre-trip Audible/Visual Alarm for 60 seconds at 10% State of Charge A Grade Aluminium-cased Prismatic Cells...