Upgrade Your Lifetime Trolling Motor Battery to Smart SystemSmart Bluetooth 5.0: auto-connection with the phone, smart control discharging, monitoring battery status and data in real-time, checking battery system with ease.Low-Temp Cut-Off Protection: 0℃/32°F charging off and -20℃/-4°F discharging off intelligently.Top EV-Grade LiFePO4 Cells:  lighter, safer, and more efficient EV-Grade LiFePO4 cells, 4000+ deep cycles @100%DOD.LiTime Smart 100A BMS: 20+ protections; auto-recovery after overload protection (30s); strong defense against moisture & salt spray.Max.100A Continuous Charging/Discharging Current, peak 500A/1s Current.IP65 Waterproof & Dust Proof: double protection in marine and humid environments. Support 12-Volt System: suitable for 12V DC loads on board.Group 31 Size: 13*6.77*8.5 inch, easy to replace lead-acid batteries.Wide-Scenario Application: suited in 30~70 lb trolling motor/marine/camping/RVs/off-grid etc.Max. 4P4S: to build a 51.2V 400Ah battery system (Max. 20.48kWh of energy).4 Fast Charging Ways: LiFePO4 charger/solar panels/generator/alternator(Max 1C charging).Professional Testing & Certi.: UL1973, FCC, CE, RoHS, UN38.3 Certified.ABYC Official Certi.: all LiTime marine batteries meet ABYC standards, and safeguard your sail.Best Service: fast delivery, 24-hour online service, lifetime technical support & 5-year warranty.Note: Upon initial use or after manually powering off the battery, please ensure to connect the charger to turn on the battery. Recommended LiTime 14.6V 20A charger.Do NOT use it as a Starter Battery.