Safer Metal Shell Design: Metal casing design, giving 12V 165AH LiFePO4 battery more safety compared to ordinary plastic models, can flame retardant explosion-proof Anti-collision. Low Temp Cut-Off: DC HUSE 12V 165ah lifepo4 battery has upgraded Low Temperature Protection. When the temperature sensor of 165Ah lifepo4 detects that the temperature is below 19.4℉, the BMS will cut off the charging function, cut off the discharge when it is below -4℉, and automatically recover after the temperature rises to 32℉. Effectively protect the 12V 165Ah battery and extend the battery life Bluetooth APP Monitoring: DC HOUSE 12V 165AH battery has built-in Bluetooth, which can connect with DC HOUSE APP (Bluetooth signal range 5-10 meters. It is convenient to monitor battery information such as SOC, voltage, current, etc., and the data is accurate to the specific cell of a battery, there is a special fault display page to help troubleshoot 10 Years Life & Up to 15000 Cycles: The 12V 165Ah lithium battery uses a Class A LiFePO4 battery, which the cells inside the battery are UL,IEC tested and CE,RoHS certified, providing the highest level of safety for you. The battery has up to 15,000 cycles and a service life of 10 years. In contrast, lead-acid/SLA/AGM batteries typically only last 3 years with 200-500 cycles Wide Application: 165AH LiFePo4 lithium battery is perfect for RV, Boat, Trolling Motor, Fish Finders, Ice Fishing, Camping, Solar System, and Home Alarm Systems. Please charge the battery with a dedicated LITHIUM BATTERY CHARGER, and no more than 4 batteries in series or parallel Capacity Expansion: The 165AH lithium battery can be used not only in parallel connections but also in series. The 165Ah batteries can be safely connected in series and in parallel （4P2S/2S4P） for larger capacity (Max 660Ah ) and higher voltage (24V, 36V, 48V)，which will delivery an impressive 16.9KWh Energy. DC HOUSE Service: DC HOUSE is committed to providing 3 years of reported service for every battery sold. If you need help, please get in touch with us through Amazon or the after-sales address in the manual. We will provide professional and complete advice on battery connection, charging, and discharging Attention: It is best to maintain a voltage difference of 0.1V between batteries in series or parallel (note: this refers to the battery packs, not the individual battery cells). DC HOUSE 12V 165Ah Lithium LiFePO4 Deep Cycle Battery, Safer Metal Shell, Built-in BMS, Lithium Iron Phosphate Rechargeable Battery for RV, Golf Cart, Marine, Solar, Home Energy Storage, Off-Grid Applications