Product overview
LMFP · 33140 · Lithium manganese iron phosphate · Special order
LMFP (lithium manganese iron phosphate) 33140 battery cells, 3.6 V 15 Ah, sold in 4-packs for DIY packs and chemistry testing. Each cell stores 54 Wh, is rated 3C (45 A) continuous and 1,500 to 2,000 full cycles. LMFP charges to 4.2 V per cell, well above LFP's 3.65 V, so it needs LMFP charger and BMS settings, not LFP ones; the setpoints for 4S, 7S and 14S packs are below. This is a special order: we order the cells from the factory when you order, so allow 4 to 6 weeks.
- OGS part
- LMFP-33140-04
- Capacity
- 15 Ahrated, 0.5C [3]
- Nominal
- 3.6 Vvs 3.2 V for LFP [3]
- Energy
- 54 Whper cell [4]
- Continuous
- 45 A3C, above 0 °C [3]
- Cycle life
- 1,500–2,000full cycles to 70 % [3]
- Chemistry
- LMFPLiMnxFe1-xPO4 cathode [1]
- Format
- 33140Ø33.3 × 140.5 mm max [3]
- Build
- Bare cell · Unprotected · Grade A, factory barcode [1] · UN38.3 tested [4]
Special order: we order these from the factory when you order. Specs below are from the cell maker's datasheet [3]; we have not bench tested this cell yet.
Dimensions mm, drawn to scale
Mass 305 max g
Maximum dimensions and mass from the maker's datasheet [3]. The cells in the transport test weighed 290 g [4]. We will add our own measurements.
Why this cell
More volts per cell
3.6 Vnominal, vs 3.2 V for LFP [3]
Manganese in the phosphate cathode raises the cell voltage. At the same 15 Ah that is 12.5 % more energy than an LFP cell.
Phosphate family
1,500–2,000full cycles to 70 % [3]
LMFP keeps LFP's phosphate structure and adds manganese. The maker rates it for 1,500 to 2,000 full-depth cycles, and it has passed UN38.3 transport testing [4].
Big, simple cylinder
54 Whper cell [4]
Four cells make a 14.4 V, 216 Wh pack, with far fewer welds than an 18650 build of the same size.
Common applications
- Lab and university bench testing of LMFP chemistry
- Side-by-side comparisons with LFP and sodium-ion cells
- E-bike, scooter and e-moto packs, the format's main market [1]
- Prototype packs for robotics and small ESS
Specifications every value names its source
| Attribute | Value | Condition and source |
|---|---|---|
| Ratedfrom the cell maker's datasheet [3] unless marked | ||
| Chemistry | Lithium manganese iron phosphate (LMFP) | LiMnxFe1-xPO4 cathode, stated in writing [1]. Mn ratio: requested |
| Capacity, rated | 15 Ah | 0.5C discharge to 2.3 V at 20 ± 5 °C [3] |
| Capacity, minimum | 14.5 Ah | 0.5C [3] |
| Nominal voltage | 3.6 V | [3] |
| Energy, rated | 54 Wh | [4] |
| Charge voltage | 4.2 V | CC-CV; never above 4.25 V, the absolute maximum [3] |
| Discharge end voltage | 2.3 V | [3] |
| Standard charge | 0.5C (7.5 A) to 4.2 V | then hold 4.2 V until current falls below 0.02C (0.3 A) [3] |
| Max charge current | 1C (15 A) | at 10–45 °C; 0.2C (3 A) at 0–10 °C; no charging below 0 °C [3] |
| Max continuous discharge | 3C (45 A) | above 0 °C; 1C (15 A) from −10 to 0 °C; 0.5C (7.5 A) from −20 to −10 °C [3] |
| Pulse discharge | 6C (90 A), 10 s | above 0 °C [3] |
| Internal resistance | ≤ 3 mΩ | AC impedance, 1 kHz [3] |
| Cycle life | 1,500–2,000 cycles | 0.5C charge to 4.2 V, 1C discharge to 2.3 V (full depth), room temperature, until capacity falls below 70 % [3] |
| Charge temperature | 0 to 45 °C | full 1C only from 10 °C up [3] |
| Discharge temperature | −20 to 55 °C | current derates below 0 °C (see discharge) [3] |
| Max cell surface temperature | 55 °C charging · 60 °C discharging | [3] |
| Storage temperature | 15 to 35 °C | recommended. Over 3 months: check every 3 months and top up any cell below 3.0 V [3] |
| Transport certification | UN38.3, passed | tests T.1–T.8 (T.7 not applicable to cells), UN Manual of Tests and Criteria Rev. 8, report 2025-11-13 [4] |
| Grade | Grade A, new production | each cell carries its factory barcode [1] |
| Performanceminimum capacity the cell must deliver, from the maker's test criteria [3] | ||
| Capacity by discharge rate | 0.2C ≥ 100 % · 0.5C ≥ 97 % · 1C ≥ 95 % · 2C ≥ 93 % · 3C ≥ 90 % | of rated capacity, discharged to 2.3 V [3] |
| Capacity by temperature | 0 °C ≥ 80 % · −10 °C ≥ 70 % · −20 °C ≥ 60 % | 0.2C discharge to 2.3 V after 3 h at temperature [3] |
| Self-discharge | ≥ 90 % left after 28 days | full charge stored at 25 °C; ≥ 98 % recovers on recharge [3] |
| Calculatedarithmetic on [3] and [4], shown so you can check it | ||
| Energy per cell | 54 Wh | 15 Ah × 3.6 V |
| Energy density, volumetric | ≈ 441 Wh/L | 54 Wh ÷ 122 cm³ (Ø33.3 × 140.5 mm max [3]) |
| Energy density, gravimetric | ≈ 177 Wh/kg | 54 Wh ÷ 305 g max [3]; ≈ 186 Wh/kg at the 290 g of the tested cells [4] |
| Standard discharge | 0.5C (7.5 A) | the rate behind the 15 Ah rating [3] |
| Energy vs LFP at the same capacity | +12.5 % | 3.6 V ÷ 3.2 V |
| 4S pack (one 4-pack) | 14.4 V · 15 Ah · 216 Wh | 4 × 3.6 V, 4 × 54 Wh; charges to 16.8 V |
| Usable capacity, typical inverter window | Not tested yet | we will bench test this cell before we stock it |
BMS and charger setpoints
Per-cell values from the maker's datasheet [3], multiplied out. 14S suits a 48 V system (58.8 V full); 16S charges to 67.2 V, above what most 48 V inverters accept. Check your inverter's limits.
| Setpoint | Per cell | 4S | 7S | 14S |
|---|---|---|---|---|
| BMS over-voltageabsolute maximum; never charge above it [3] | 4.25 V | 17.0 V | 29.8 V | 59.5 V |
| Charge voltage (CV)charger setpoint; end charge at 0.02C (0.3 A) [3] | 4.2 V | 16.8 V | 29.4 V | 58.8 V |
| Nominal[3] | 3.6 V | 14.4 V | 25.2 V | 50.4 V |
| Discharge end / BMS under-voltagedatasheet end voltage [3]. Set your inverter's low cut-off above this; we will suggest a value from our bench test | 2.3 V | 9.2 V | 16.1 V | 32.2 V |
Batch history
Special order. Each order is placed with the factory when you order.
| Batch | Capacity | Nominal | Continuous | Status |
|---|---|---|---|---|
| A | 15 Ah | 3.6 V | 3C | special order |
Works with this cell parts we sell that are set up for it
Testcheck cells before you build
EBC-A20 capacity tester$206.00
Internal resistance tester$104.00
Questions builders ask
Is LMFP the same as LFP?
No. LMFP adds manganese to the lithium iron phosphate cathode. That raises the nominal voltage from 3.2 V to 3.6 V per cell, so it holds more energy at the same capacity.
Can I use an LFP charger or BMS?
No. These cells charge to 4.2 V per cell and stop discharging at 2.3 V, so LFP limits do not fit. Set the charger to 4.2 V per cell (16.8 V for 4S, 58.8 V for 14S) and the BMS over-voltage no higher than 4.25 V per cell. The full table is on this page.
Can I charge them in the cold?
Not below 0 °C. Between 0 and 10 °C charge at 0.2C (3 A) or less. Full 1C charging is rated from 10 to 45 °C. They can discharge down to −20 °C at reduced current.
When do these ship?
They are a special order. We order them from the factory when you order, so allow 4 to 6 weeks. We will email you if anything changes.
Sources
- [1] Written statements from the cell maker, 2026-11-06 and 2026-11-07: LMFP (LiMnxFe1-xPO4) cathode, made in its own factory, Grade A, new production, factory barcode on each cell; the 33140 is mainly used in e-motorcycle packs.
- [2] Cell maker's product listing for this 33140 LMFP cell: 3.6 V, 15 Ah, 54 Wh, 3C.
- [3] Cell maker's datasheet (specification for approval), LMFP 33140-15A, issued 2024-09-30.
- [4] UN38.3 test summary for the LMFP 33140-15A cell, independent test lab report dated 2025-11-13: 3.6 V, 15 Ah, 54 Wh, 290 g; all applicable tests passed.