EVE MB31 vs LF356: 3.2V 314Ah and 3.2V 356Ah LiFePO4 Cell Comparison
When building a DIY residential energy storage system, choosing the right LiFePO4 Cell is one of the most important decisions. Cell capacity, nominal voltage, dimensions, internal resistance, cycle life, charging limits, and mechanical requirements can all affect the final battery design.
The EVE MB31 is a 3.2V 314Ah prismatic LiFePO4 cell with a nominal energy of 1004.8Wh. The newer LF356L, often referred to in searches as LF356, provides a nominal capacity of 356.3Ah and 1140Wh at the same 3.2V nominal voltage.
EVE MB31 Overview
The EVE MB31 is a prismatic LFP rechargeable lithium-ion cell manufactured by EVE Power Co., Ltd. The MB31 product specification identifies it as a prismatic LFP cell with a nominal capacity of 314Ah and a nominal voltage of 3.2V.
The MB31 specification lists a nominal energy of 1004.8Wh, an end-of-charge voltage of 3.65V, standard and maximum continuous charging/discharging power of 0.5P at the specified test condition, an initial internal resistance of 0.18mΩ ±0.05mΩ, and a weight of 5600g ±300g.
- Nominal capacity: 314Ah
- Nominal voltage: 3.2V
- Nominal energy: 1004.8Wh
- End-of-charge voltage: 3.65V
- Standard charging power: 0.5P
- Maximum continuous charging power: 0.5P
- Standard discharging power: 0.5P
- Maximum continuous discharging power: 0.5P
- Initial internal resistance: 0.18mΩ ±0.05mΩ
- Weight: 5600g ±300g
EVE MB31 Specifications: 3.2V 314Ah LiFePO4 Cell
The term 3.2V 314Ah describes the two fundamental electrical characteristics of the MB31. The 3.2V figure is the nominal voltage, while 314Ah represents the nominal capacity under the conditions defined in EVE's specification.
The MB31 314Ah rating is specified for testing at 25°C ±2°C and 0.5P charge/discharge conditions over a 2.5V to 3.65V range.
EVE MB31 Physical Dimensions
| Parameter | EVE MB31 |
|---|---|
| Nominal Capacity | 314Ah |
| Nominal Voltage | 3.2V |
| Nominal Energy | 1004.8Wh |
| Height with terminal | 207.2 ±0.5mm |
| Height without terminal | 204.6 ±0.5mm |
| Length | 173.7 ±0.5mm |
| Thickness | 71.7 ±0.8mm |
| Pole center distance | 123.0 ±0.3mm |
| Weight | 5600 ±300g |
These dimensions matter when designing a battery box, compression structure, busbar arrangement, or DIY battery enclosure. A cell's physical dimensions should be matched with the available enclosure rather than selecting cells based only on capacity.
EVE MB31 Performance and Cycle Life
One of the most important specifications of the EVE MB31 is its stated cycle-life performance. The EVE specification lists 8000 cycles at 25°C and 70% SOH.
This figure is a specified test condition, not a guarantee that every installed battery will achieve exactly 8000 cycles. Actual battery life depends on operating temperature, charge and discharge conditions, depth of discharge, cell matching, BMS configuration, mechanical compression, voltage limits, and thermal management.
The MB31 specification also gives maximum continuous charging and discharging power of 0.5P at 25°C ±2°C under the stated conditions. Its standard charging mode is charging to 3.65V with a constant power of 502.4W.
EVE MB31 vs LF356: Key Differences
The most useful comparison is between the EVE MB31 and LF356/LF356L. Both are 3.2V-class prismatic LFP cells, but the LF356L has a higher nominal capacity.
| Specification | EVE MB31 | EVE LF356L |
|---|---|---|
| Cell type | Prismatic LFP | Prismatic LFP |
| Nominal voltage | 3.2V | 3.2V |
| Nominal capacity | 314Ah | 356.3Ah |
| Nominal energy | 1004.8Wh | 1140Wh |
| Initial internal resistance | 0.18mΩ ±0.05mΩ | 0.15mΩ ±0.05mΩ |
| Weight | 5600 ±300g | 6220 ±150g |
| Cycle life | 8000 cycles, 70% SOH | 8000 cycles, 70% SOH |
| Standard charge/discharge power | 0.5P | 0.5P |
EVE MB31 vs LF356 Capacity
The MB31 provides 314Ah, whereas LF356L provides 356.3Ah. The difference is 42.3Ah, or approximately 13.5% more nominal capacity for LF356L.
- MB31: 3.2V × 314Ah = 1004.8Wh
- LF356L: 3.2V × 356.3Ah = 1140Wh
Therefore, one LF356L cell provides approximately 135.2Wh more nominal energy than one MB31 cell.
EVE MB31 vs LF356 Internal Resistance
The specification lists an initial internal resistance of 0.18mΩ ±0.05mΩ for MB31 and 0.15mΩ ±0.05mΩ for LF356L. These values should be interpreted together with the specified measurement conditions and should not be treated as a complete system-level performance score.
EVE MB31 for DIY Energy Storage
The EVE MB31 is relevant to DIY residential energy storage because a 16S configuration creates a nominal 51.2V battery.
16S EVE MB31 Battery
A typical 16S configuration contains 16 EVE MB31 cells:
16 × 3.2V = 51.2V
With 314Ah cells, the nominal energy is approximately:
51.2V × 314Ah = 16.08kWh
This configuration is commonly associated with 48V-class inverter systems. Actual inverter compatibility depends on the inverter voltage range, charging voltage, current limits, BMS communication requirements, and other electrical specifications.
The EVE cell specification should therefore be treated as a cell-level specification rather than approval for a complete battery system. EVE states that module- and system-level safety compliance requires customer design verification.
EVE MB31 and LF356 Battery Pack Sizing
Capacity is one of the clearest ways to compare these two cells for DIY battery design.
16S EVE MB31
16 × 3.2V = 51.2V
Nominal energy: 51.2V × 314Ah = 16.08kWh
16S LF356
16 × 3.2V = 51.2V
Nominal energy: 51.2V × 356.3Ah = 18.24kWh
The same 16S architecture can therefore provide approximately 16.08kWh with MB31 cells or 18.24kWh with LF356L cells. The nominal system voltage remains 51.2V, while the stored nominal energy changes with cell capacity.
EVE MB31 LiFePO4 Cell Safety Considerations
The MB31 specification includes cell-level safety tests. Under the specified test conditions, the document reports no fire or explosion for over-charge, over-discharge, external short-circuit, crush, drop, heating, and thermal runaway tests.
BMS
A battery management system should be selected according to series cell count, maximum continuous current, charge current, discharge current, temperature monitoring, protection thresholds, and communication requirements.
Cell Matching
For multi-cell battery construction, capacity, internal resistance, voltage, and SOC consistency should be evaluated before assembly.
Mechanical Compression
Prismatic cells can experience expansion during operation. The battery enclosure should therefore be designed with the manufacturer's mechanical requirements in mind rather than simply holding the cells loosely.
EVE MB31 or LF356: Which Cell Fits Your Battery Design?
The choice between EVE MB31 and LF356 should be based on the requirements of the battery system rather than capacity alone.
EVE MB31 Design Considerations
- 314Ah cell capacity
- 3.2V nominal voltage
- Approximately 1kWh nominal energy per cell
- 16S 51.2V battery architecture
- Existing MB31 enclosure designs
- Existing busbar and BMS layouts
- Established MB31 battery pack dimensions
LF356 Design Considerations
- 356.3Ah nominal capacity
- 3.2V nominal voltage
- Approximately 1.14kWh nominal energy per cell
- Higher nominal energy in the same 16S cell count
- LF356L product specification dated March 2026
The LF356L specification lists 1140Wh nominal energy compared with 1004.8Wh for MB31. Physical dimensions must also be checked before using LF356L as a replacement in an existing MB31 battery enclosure.
EVE MB31 and LF356 FAQ
Is EVE MB31 a 3.2V 314Ah LiFePO4 Cell?
Yes. The EVE MB31 specification identifies a nominal capacity of 314Ah and nominal voltage of 3.2V, with nominal energy of 1004.8Wh.
Is LF356 a 3.2V 356Ah battery cell?
The uploaded EVE specification identifies the product as LF356L, with a nominal capacity of 356.3Ah and nominal voltage of 3.2V. Therefore, “3.2V 356Ah” is a rounded description of the 356.3Ah specification.
How much energy does one EVE MB31 cell store?
The MB31 specification gives a nominal energy of 1004.8Wh, or approximately 1.0kWh per cell.
How much energy does one LF356L cell store?
The LF356L specification gives a nominal energy of 1140Wh, or 1.14kWh per cell.
How many EVE MB31 cells are required for a 51.2V battery?
A 16S configuration uses 16 cells: 16 × 3.2V = 51.2V. With 314Ah cells, the nominal energy is approximately 16.08kWh.
Does EVE MB31 have an 8000-cycle life?
The EVE specification lists 8000 cycles at 25°C and 70% SOH. This is a specified test condition rather than a guarantee that every installed battery will achieve exactly 8000 cycles.
Internal Links
- DIY LiFePO4 Battery Guide
- What Is a BMS?
- EVE Battery Cells
- LiFePO4 Battery Cells
- DIY Residential Energy Storage
- EVE MB31 Product Page
External Resources
Technical Source Notes
Primary source 1: EVE Power Co., Ltd., “Product Specification — Prismatic LFP Cell — Model MB31,” Specification No. PBRI-MB31-D06-01, Version A, November 2023.
Primary source 2: EVE Power Co., Ltd., “Product Specification — Prismatic LFP Cell — Product LF356L,” Specification No. JMRI-LF356L-V1-D06-01, Version A, March 2026.
The MB31 and LF356L specifications are cell-level documents. Battery pack, inverter, BMS, enclosure, transportation, certification, and system-level compliance should be verified separately for the intended application.