EVE MB31 3.2V 314Ah LiFePO4 Prismatic Battery Cell – 1kWh Energy Block

A group of four fresh EVE MB31 Grade A LiFePO4 prismatic cells connected with busbars, showcasing the premium blue aluminum shell and secure terminal connections for solar storage systems.

EVE MB31 (314Ah): The 1kWh Battery Cell

The EVE MB31 represents a major milestone in battery engineering. It is one of the first mass-produced prismatic Lithium Iron Phosphate (LiFePO4) cells to exceed the 300Ah barrier significantly. With a nominal capacity of 314Ah, a single cell holds over 1,000 Watt-hours (1kWh) of energy, setting a new standard for energy density.

Why Upgrade to MB31?

Maximize Your Space: The MB31 shares a very similar footprint to standard 280Ah cells but delivers roughly 12% more energy. A standard 16S (48V) pack now provides 16.1 kWh instead of 14.3 kWh.
Advanced Technology: Utilizing EVE’s latest chemistry, the MB31 achieves an ultra-low internal resistance of 0.18mΩ. This means less heat generation and higher efficiency during charging and discharging.
8,000 Cycle Life: Built for the long haul, this cell is rated for 8,000 cycles, ensuring reliable operation for over 15 years in solar storage applications.

Why Buy from DLCPO?

Genuine Grade A: The MB31 is a new high-demand product. We guarantee authentic, Grade A cells directly from EVE factories with valid QR codes.
Precision Matching: With such high capacity, cell balance is critical. We test every cell’s voltage and IR to ensure you receive a perfectly matched set.
Complete Assembly Kits: We include high-current busbars and nuts. We also offer laser-welded M6 studs to simplify your connections.

❓ Q:❓Q: Is this the same size as 280Ah cells?

💡 A:

A: It is compatible with most 280Ah fixtures. It follows the standard VDA dimensions, making it an easy upgrade for existing designs that need more capacity.

❓ Q:❓Q: What is the real capacity?

💡 A:

A: The nominal capacity is 314Ah. In real-world tests at standard temperatures, these cells often test slightly higher, delivering true 1kWh+ performance per cell.

❓ Q:❓Q: Can I discharge in freezing weather?

💡 A:

A: Yes, the MB31 specification supports discharging down to -30°C, making it suitable for unheated outdoor storage systems.

Main technical specifications

EVE MB31 3.2V 314Ah Grade A LiFePO4 Prismatic Cell

The EVE MB31 is a breakthrough 314Ah LiFePO4 prismatic cell. Packing over 1kWh of energy (1004.8Wh) into a standard form factor, it features ultra-low internal resistance (0.18mΩ) and a robust life of 8,000 cycles. It represents the highest energy density currently available for standard DIY battery banks.

Technical Specifications:

Parameter	Specification
Brand	EVE
Model Name	MB31
Nominal Capacity	314Ah
Nominal Voltage	3.2V
Nominal Energy	1004.8 Wh
Initial Internal Resistance	0.18mΩ ± 0.05 mΩ
Standard Charging/Discharging Power	0.5P
Dimensions (LTH1)	173.7 x 71.7 x 207.2 mm
Body Height (H2)	204.6 mm ± 0.5 mm
Terminal Center Distance (D)	123.0 ± 0.5 mm
Weight	5600g ± 300g
Cycle Life (25°C)	8,000 Cycles
Discharging Temperature	-30°C ~ 60°C

Drawing

Applications

High-Density ESS: Build a 16kWh battery pack using just 16 cells (compared to 14kWh with 280Ah).
Commercial Storage: Maximizes ROI with 8,000 cycle life and high energy density.
RV & Marine: Get more power in the same physical space as older battery banks.
Industrial: Supports -30°C discharge for demanding environments.

Warnings & Cautions

Stop charging cells if charging isn’t completed within the specified time.

Stop using cells if the battery becomes abnormally hot, develops an odor, becomes discolored, deformed, or develops any other abnormal conditions during use, charge, discharge, or storage.

Keep away from fire or hot heat sources immediately when a leakage or foul odors are detected. If liquid leaks onto your skin or cloths, wash it out with plenty of fresh water immediately if liquid leaks from cells and gets into your eyes, don’t rub your eyes. Wash your eyes out with plenty of clean water and seek medical attention immediately.

Notice: MB31 packs significantly more energy (314Ah) than standard cells. Ensure your BMS is programmed for the correct capacity. Compression is recommended.