Diypow 12V 400AH Deep Cycle LiFePO4 Battery Pack | 5.12KWh & 5.12kW

$1,399.99 USD$1,429.99 USD
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  APP Support & Bluetooth Connection

  High & Low-Temp Protection

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  10-Year Warranty Guaratee

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Type: Standard Version

Standard Version
Bluetooth BMS Version
$2,199.99 USD $1,399.99 USD SAVE $800.00 USD

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  Key Features

  • 400 Amp hours of capacity provides a full day of power for mid-sized trolling motors or for long days on the open road in your RV. 
  • Ideal for deep cycle applications where you need lots of power for a long time. Easily link in series to create 24V, 36V, or 48V systems.
  • The working temperature can reach -30°C.
  • Long life expectance 15 years @25°C in 80% DOD, service life 4000 cycles.
  • Battery Management Systems (BMS) with power terminal cut-off & recovery.
  • Cell balancing and protection against low voltage/overvoltage.
  • Bluetooth is optional, easily get the battery status through the mobile APP (including voltage, capacity, temperature, status, etc.)
  • Maintenance-free, fully sealed, and IP67 waterproof.
  • Grade-A Cells with MSDS, CE, UN38.3 Certificate.

12 Volt 400Ah Lithium Battery

Built Diypow tough, this 12 volt lithium battery packs a big punch. Using lithium iron phosphate (LiFePO4) technology, this battery delivers twice the power, half the weight, and four times the life compared to sealed lead-acid batteries - providing excellent lifetime value. 400 amp-hour capacity provides all-day power for high-amperage trolling motors or long drives in motorhomes. Ideal for deep cycle applications such as trolling motors, solar storage, or boating where large amounts of power are required over long periods of time. Same performance as our legendary 50 amp battery, but with 80% more capacity. Want to know more about how to use a 12V lithium battery? Please click here.

Diypow 12V 400AH Deep Cycle LiFePO4 Battery Pack | 5.12KWh & 5.12kW

Longer Battery Life

Our 400 Ah 12 V LiFePO4 Deep Cycle battery has a life expectancy of 4000 cycles with a 200 Amp Continuous current, 200 Amp Surge Current (30 seconds), and ½ second surge for higher loads.

12V 400AH Deep Cycle LiFePO4 Battery Pack

Reliable BMS System

The advanced BMS utilizing the software controller intelligently monitors the battery's operating conditions and oversees its safe operations. Continuously monitors conditions, redistributes energy resources in no time flat, and sends alerts in the event of a problem.

12V 400AH Deep Cycle LiFePO4 Battery Pack

Auto-balancing Function

Due to the upgraded auto-balancing function, you can combine batteries in parallel more safely. We recommend connecting the batteries with appropriate cables to achieve optimal effect. Please note that do not connect batteries in series, and the maximum number that can connect in parallel is 8.

Bluetooth Monitors Battery(Optional)

Bluetooth 5.0 is designed to reduce the energy consumption of Bluetooth peripherals. It is faster and operates over longer distances than older versions. You can easily monitor the status of your battery more accurately and conveniently in real-time.

Low-Temperature Self-Heating Function

The intelligent self-heating function will start operating automatically once the battery’s core temperature drops below 41°F (5°C), effortlessly keeping your battery charged in cold environments. Plus, this function is powered by the Charger/Controller's current instead of the battery itself.

12V 400AH Deep Cycle LiFePO4 Battery Pack

Support 4 Parallel 4 Series

Connecting battery cells gains higher voltages or achieves improved current loading.

Diypow 12V 400AH Deep Cycle LiFePO4 Battery Pack | 5.12KWh & 5.12kW

Lighter Weight

The battery case is made of high-quality ABS material with good sealing performance and solid construction. It weighs about half as much as a lead-acid battery of the same capacity. In usage scenarios, such as RV, it can lead to more free space.

Maintenance free

Lithium-ion batteries last two to four times longer than lead-acid batteries. Frequently having to maintain your lead-acid batteries can be time-consuming and costly. However, Diypow lithium-ion batteries are virtually maintenance-free and do not require frequent watering, equalization charging, or cleaning.

10 Years Warranty

Diypow LiFePO4 battery has obtained CE, RoHS, PSE, and WEEE certifications. All lithium iron phosphate batteries come with a 10-year conditional warranty covering defects in materials and workmanship starting from the date of purchase. And the battery charger comes with 90 days warranty.

12V 400AH Deep Cycle LiFePO4 Battery Pack

Wide Applications for Home & Outdoors

Diypow 400Ah 12V lithium battery could connect max 4 parallel to build a 48V(51.2V) 400Ah battery system, which could support 5.120KW max. load power, 5120KWh max. Energy. So our lifepo4 battery 12v 400Ah is perfect for wide applications, such as home backup power, RV, Solar, Marine, trolling motor, off-grid system, etc.

Diypow 12V 400AH Deep Cycle LiFePO4 Battery Pack | 5.12KWh & 5.12kW


  • Our 12V 400Ah batteries have a maximum charge current of 14.6V and a discharge cut-off voltage of 10.5.
  • The Maximum Batteries in Serial is 4 to get higher voltage to 24V, 36V, 48V. Maximum Batteries in Parallel is 10.
  • Your 12V 400Ah battery can be fully charged with a standard lead-acid charger that reaches 14.4-14.6 volts.
  • Battery chargers with voltages below 13.6 volts will only charge the battery to 50% of its capacity or less.
  • Looking for a 12V 100Ah lithium battery? Click here.

Find the battery you want quickly

Diypow - Lithium Marine Batteries

             - RV Batteries

             - Fishing Kayak Batteries

             - Solar Batteries

             - Golf Cart Batteries

             - Trolling Motor Batteries

             - OFF-Grid Batteries

             - Home Energy Storage System

If you have any questions regarding this product, please drop us a line or email at for troubleshooting assistance. Our one-on-one customer service will get back to you within 24 hours.

12V 400AH Deep Cycle LiFePO4 Battery Pack

Diypow Support OEM Customized

We have strong supply chain resources to provide you with customized services for your batteries. Including the color of the battery casing, logo customization, and Bluetooth software customization. If you want to know more about customization x information, please drop us a line or email at for resource assistance.

Model KH-LFP12400
Nominal Voltage 12.8 V
Capacity 400 AH
Nominal Energy 5120 WH
Life Cycles 4,000 @ 80% DOD
BMS Board Yes (Internal)
BMS Rating 100A BMS
Mechanical Performance
Cell Type Grade A LiFePO4 Cells (Prismatic Cell)
Number of Cells 4
Terminal M8*16mm (L)
Weight 97 lbs (44kg)
Dimensions 20.47″ (L) x 10.55″ (W) x 9.05″ (H) (520x268x230mm)
Waterproof Rating IP67
Charge Performance
Max Charge Current 100 A
Charge Current Recommended ≤ 25 A
Recommended Charge Voltage 15.2V. Please use the LiFeP04 battery charger, the SLA charger may work but will reduce the performance and lifespan of the battery.
Internal Resistance ≤20.0 mΩ
Maximum Batteries in Serial 4 (get higher voltage to 24V, 36V, 48V)
Maximum Batteries in Parallel 10
Maximum Configuration 4S4P
Discharge Performance
Max Discharge Current 200A
Recommended Discharge Voltage 9.6V
Max Depth of Discharge (DoD) 100%
Temperature Performance
Operating Temperature (Charge) 0~50℃ (32℉~122℉)
Operating Temperature (Discharge) -20~60℃ (-4℉~140℉)
Operating Temperature (Storage) -10~50℃ (14℉~122℉)

Why Buy from Diypow?

Grade-A Cells at Super Friendly Price

We do 100% testing of all Diypow batteries before shipping to you, with grade-A cells and high-quality materials at radically prices than comparable retails.

229 Core Technologies Ensure High Quality

With 13 years of experience in lithium technology, we guarantee high-quality products through our 229 core technologies.

Lifetime Technical Consult Service

Diypow provides 10-year warranty for batteries (2-year for chargers) and lifetime consultation support, we hope you can feel easy and enjoyable when you use the battery.

We Love to Help

Our Team injects passion, integrity, respect, and professionalism into our LiFePO4 batteries and business, if you have any questions, please feel free to contact us, we love to help.