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[Real Capacity About 325-335Ah] Nomial capacity 314Ah, actual capacity About 325Ah-330Ah, higher energy density, compact size.
[Free Accessories] Provide all necessary accessories for DIY batteries, including flange nuts, busbars, epoxy plates and studs(Already welded at the electrode).The busbar is made of nickel-plated copper, which provides excellent conductivity and high current carrying capacity.
[Already Matched] All cells have consistent voltage, internal resistance, and capacity, allowing for direct assembly without the need for balancing.
[8000 Cycles] At 25 ℃, 10%-90% humidity, the battery is subjected to a pressure of 300 kgf and a charge and discharge power of 0.5P. After 8000 cycles, the actual remaining capacity is greater than 70% (SOH ≥ 70%).
[Quality and safety certification] MB31 cells have passed UL1642, UL1973, UL9540A, IEC62619, UN38.3 and other quality and safety certifications.
Description
xThese cells are suitable for residential energy storage systems(RESS) and RV energy storage system(12.8V-51.2V system) and are not recommended for assembly into high-voltage systems(above 96v system).
EVE MB31 cells are primarily intended for energy storage systems (ESS) and are not recommended for EV systems (electric vehicles, forklifts, etc.).
Performance & Safety
The cell delivers an actual capacity of 325Ah–335Ah, providing consistent and reliable energy output. It is rated for up to 8,000 charge–discharge cycles at 70% State of Health (SOH), supporting an expected service life of up to 15 years under normal operating conditions.
Built with LiFePO₄ (lithium iron phosphate) chemistry, the cell offers excellent thermal stability and safety. The material is inherently non-flammable and non-explosive, making it a dependable choice for long-term energy storage applications.
Cell Appearance & Structure
The MB31 prismatic cell is equipped with a single aftermarket M6 stud and features an intact, scannable QR code.
The cell has a clean, well-finished appearance with a flat and even surface, ensuring reliable installation and a professional overall look.
Intact QR
The battery cells come with intact, original factory QR codes, allowing for traceable testing data, and a factory test report is provided.
What Will You Get?
One Box include 4 MB31 cells+4 epoxy plate+4 busbars+8 flange nuts
Included Accessories
The busbars are manufactured from nickel-plated copper with dimensions of 90 × 20 × 2 mm, offering excellent conductivity and corrosion resistance. They are designed to reliably support a continuous discharge current of up to 200A.
A 0.5 mm thick epoxy insulation board is included for enhanced electrical safety, along with matching flange nuts to ensure secure and stable installation.
Packaging & Protection
Our products are packaged in UN3840-compliant cardboard boxes, constructed with five layers of high-strength corrugated board to ensure exceptional rigidity and durability during transportation.
The outer surface is fully sealed with transparent waterproof tape, effectively protecting the carton from rain and moisture exposure.
Inside the box, the battery cells are fully encased in custom-made, extra-thick protective foam, which provides superior shock absorption and prevents movement, significantly reducing the risk of damage from vibration or impact during shipping.
Wistek's classification of LiFePO4 prismatic cell quality.
| Wistek's classification and description of battery cell quality levels |
| Feature | Grade A | ESS Grade | Grade B | Grade C |
| Application | High Voltage ESS | Low Voltage ESS | Laboratory demonstrations or teaching | No Recommed to use |
| Discharge Rate | Stable | Slightly Unstable | Lower | Unpredictable |
| Cycle Life | Meets the specifications | Meets the specifications | Lower Cycle Life | Unpredictable |
| Internal Resistance | Lowest | Lower | Unpredictable | Unpredictable |
| Condition | Brand New | Brand New | Brand New | Used |
| Original Shipping Test | Availiable | Availiable | No | No |
| QR | Intact | Intact | Mark B or Reprint | Reprint |
| Appreance | Neat and without bulges. | Neat and without bulges. | Slight bulging | Bulges |
Specification
x|
Model |
EVE MB31 |
|
Nominal Capacity |
314Ah(1004.8Wh) |
|
Norminal Voltage |
3.2V |
|
Number of Cycles |
≥8000cycles@70%SOH |
|
Charging Voltage |
4.2V |
|
Maxinum Charge Current |
157A |
|
Maxinum Discharge Current |
157A |
|
Temperature Range(discharge) |
-30°C~66°C |
|
Connection Screw |
Single M6 |
|
Warranty |
5 years |
|
Weight |
5.6KG |
|
Dimensions(W*T*H) |
173*72*208mm |
FAQ
x● Is the battery cell of brand new A-grade quality?
In this batch, we are supplying ESS grade,brand new cells.
● How do I distinguish between Grade A and Grade B batteries?
1. Verify that the QR code is original and not reprinted.
2. Check for the original factory inspection report.
3. Determine the difference in voltage, internal resistance, and capacity between cells from the same
batch as reported in the original factory inspection report.
● Do I need to balance the battery cells after receiving them?
No. We balance the battery cells before shipping, so you can assemble them directly.
● Why is the internal resistance I measured much higher than the one in the
datasheet?
The internal resistance listed in the datasheet is the resistance without the studs
soldered to the battery. Your measurement likely includes the resistance of the M6 studs, so your
value is slightly higher.
Of course, the battery cell's internal resistance is also affected by the cell's charge level, humidity,
and the test equipment.
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