Molicel P50B 21700
5000mAh / 60A
Market-leading 5.0Ah 21700 ultra-high-power lithium-ion cell engineered for applications that demand both high discharge current and high energy density.
Molicel 21700 P50B 5000mAh 60A Battery
The Molicel P50B is a next-generation 21700 power cell built for demanding designs where high current, runtime, and energy density must all be optimized together. Compared with earlier high-power 21700 cells, the P50B increases capacity to 5.0Ah while maintaining a 60A discharge-current class and very low impedance.
For professional product-page accuracy, the P50B should be presented as a 60A cell with an 80°C discharge-current cut-off condition and a 25A maximum charge current with a 70°C cut-off condition. It is an ultra-high-power bare cell and should be engineered into a protected, temperature-monitored battery system.
| Brand / Model | Molicel INR-21700-P50B |
|---|---|
| Cell Series | Molicel ultra-high-power cell |
| Cell Type | 21700 cylindrical lithium-ion rechargeable cell |
| Typical Capacity | 5000mAh / 18.0Wh |
| Minimum Capacity | 4850mAh / 17.5Wh |
| Nominal Voltage | 3.6V |
| Charge Voltage | 4.20V |
| Discharge Cut-Off Voltage | 2.50V |
| Standard Charge Current | 5.0A |
| Maximum Charge Current | 25A with 70°C cut-off Thermal control required |
| Standard Charge Time | 1.5 hours |
| Continuous Discharge Current | 60A with 80°C cut-off |
| Typical Impedance | 6.5mΩ AC at 30% SOC; 12.8mΩ DC at 50% SOC |
| Ambient Charge Temperature | -20°C to 60°C |
| Ambient Discharge Temperature | -40°C to 60°C |
| Energy Density | 714Wh/L volumetric; 260Wh/kg in the data sheet, with product page marketing also using 265Wh/kg |
| Dimensions | 21.55mm max diameter × 70.15mm max height |
| Weight | 71g max |
| Protection | No — unprotected flat-top cell |
Electrical operating envelope at a glance.
These quick-reference visuals summarize the P50B’s current capability, voltage window, energy translation, and C-rate interpretation.
1. Current Capability Stack
Key current reference points for standard charge, maximum charge, discharge-rate curves, and continuous discharge rating.
2. Voltage Operating Window
Basic per-cell voltage limits used for charger, BMS, and pack design.
3. Capacity and Energy Translation
The data sheet lists 18.0Wh typical energy.
4. C-Rate Conversion
For a 5000mAh cell, 1C equals approximately 5A.
| 1.0A | ≈0.2C low-rate reference |
|---|---|
| 2.5A | ≈0.5C reference |
| 5A | 1C standard charge reference |
| 25A | 5C maximum charge current |
| 50A | 10C high-rate discharge reference |
| 60A | 12C continuous discharge rating with 80°C cut-off |
High-current output should be evaluated with voltage sag, heat rise, and pack resistance in mind.
The P50B data sheet shows discharge-rate curves across low-current and high-current conditions, including 50A and 60A. The cell is rated for 60A continuous discharge, but that rating is tied to an 80°C cut-off condition, so real pack performance depends on cooling, interconnect resistance, BMS sizing, cell spacing, and load profile.
The simplified discharge-curve graph below visualizes voltage versus delivered capacity under light, medium, high, and maximum-current conditions. It is not a digitized manufacturer graph; it is a product-page visualization designed to show how increasing load increases voltage sag and can reduce usable capacity under cutoff-limited conditions.
Discharge-rate references
| 0.2C / 0.5C / 1C | Low-rate and normalized data-sheet curve references |
|---|---|
| 10A / 20A / 30A | Medium-to-high-load discharge curve references |
| 50A | Very-high-load data-sheet curve reference |
| 60A | Continuous discharge rating with 80°C cut-off |
| Design takeaway | For high-current packs, validate voltage sag and cell temperature under the actual enclosure, BMS, weld, and busbar design. |
5. Simplified Discharge-Curve Graph
Voltage vs. capacity illustration for 5A, 30A, 50A, and 60A operation. Simplified for product-page visualization.
6. Estimated IR Voltage Drop
Planning reference using Molicel’s typical AC and DC impedance values. Real pack sag includes cells plus interconnects.
Charge, discharge, and thermal behavior should be treated as one system.
Molicel’s P50B data sheet includes charge curves, discharge-rate curves, discharge-temperature curves, and cycle-characteristics curves. These are condensed into customer-friendly diagrams below.
7. Charge Profile Reference
Standard charge: 5A to 4.2V with 1.5-hour standard charge time. The data sheet also charts 25A maximum charge behavior.
8. Thermal Operating Envelope
Published ambient charge and discharge temperature ranges.
9. Discharge Rate Characterization
Customer-friendly summary of the P50B discharge-rate curve family.
10. Discharge Temperature Characterization
The data sheet charts discharge behavior from -40°C through 60°C.
11. Cycle-Life Visualization
Data-sheet cycle curves include +1C/-1C, +3C/-1C, +5C/-1C, and constant-power discharge families.
12. Energy Density Summary
Data-sheet and product-page energy density values for design comparison.
| Typical Energy | 18.0Wh |
|---|---|
| Minimum Energy | 17.5Wh |
| Volumetric Energy Density | 714Wh/L |
| Gravimetric Energy Density | 260Wh/kg in data sheet; product page also markets 265Wh/kg |
| Design implication | Very high energy for an ultra-high-power 21700, with strong power-to-energy ratio and low impedance. |
21700 dimensional envelope for holders, sleds, weld fixtures, and pack CAD.
The live listing uses rounded dimensions, while Molicel’s data sheet provides maximum envelope values. Use the maximum values for fixture clearance, holder selection, and pack CAD.
13. Cell Dimension Diagram
Mechanical envelope based on Molicel maximum dimensions.
14. Pack Scaling Formulas
Quick math for series/parallel planning. Validate current limits thermally and electrically.
Pack Voltage ≈ Series Count × 3.6V
Pack Capacity ≈ Parallel Count × 5.0Ah
Pack Energy ≈ S × P × 18.0Wh
Cell-Level Current Capability ≈ Parallel Count × 60A
15. Example Parallel Scaling
Approximate scaling using cell-level continuous discharge rating, not a finished-pack guarantee.
| 1P | 5.0Ah, 18.0Wh, 60A cell-level current reference |
|---|---|
| 2P | 10.0Ah, 36.0Wh, 120A cell-level current reference |
| 3P | 15.0Ah, 54.0Wh, 180A cell-level current reference |
| 4P | 20.0Ah, 72.0Wh, 240A cell-level current reference |
| 5P | 25.0Ah, 90.0Wh, 300A cell-level current reference |
16. Common Series Voltage Examples
Nominal voltage examples only. Full-charge and cut-off pack voltages scale separately.
| 1S | 3.6V nominal / 4.2V full / 2.5V cut-off |
|---|---|
| 3S | 10.8V nominal / 12.6V full / 7.5V cut-off |
| 4S | 14.4V nominal / 16.8V full / 10.0V cut-off |
| 5S | 18.0V nominal / 21.0V full / 12.5V cut-off |
| 10S | 36.0V nominal / 42.0V full / 25.0V cut-off |
| 13S | 46.8V nominal / 54.6V full / 32.5V cut-off |
Use the P50B inside a controlled electrical and thermal system.
This is an unprotected ultra-high-power cell. Safe implementation requires a charger, BMS, fuse strategy, interconnect design, and thermal-management plan that respect the cell’s limits.
17. Suggested Control Threshold Map
System-level control guidance derived from the live listing and Molicel data-sheet values.
| Charge upper limit | 4.20V per cell |
|---|---|
| Discharge floor | 2.50V per cell |
| Ambient charge range | -20°C to 60°C |
| Ambient discharge range | -40°C to 60°C |
| Standard charge | 5A CC-CV to 4.2V, 1.5-hour standard charge reference |
| Maximum charge | 25A with 70°C cut-off; validate thermally before use |
| Continuous discharge | 60A with 80°C cut-off, subject to system-level thermal and interconnect validation |
18. Risk-Control Checklist
Recommended pack-building and use practices.
- Use only in devices or packs designed for lithium-ion 21700 cylindrical cells.
- Use a BMS or controller that monitors voltage, current, and temperature.
- Do not charge above 4.20V or discharge below 2.50V per cell.
- Validate high-current operation under the actual enclosure, cooling, and load profile.
- Never carry loose cells with conductive objects such as keys, coins, tools, or metal cases.
- Spot weld for pack assembly; do not solder directly to the cell body.
- Inspect wraps and top insulator rings before use.
- Size busbars, nickel, fuses, wiring, and BMS MOSFETs for both electrical resistance and heat rise.
Best suited for premium high-demand systems that need both power and endurance.
Hyper EV / Racing
- Built for premium high-power traction and motorsport-style applications.
- Excellent power-to-energy ratio when engineered into a managed pack.
Drones / eVTOL
- Useful for heavy-lift drones, cargo drones, and eVTOL systems where weight, power, and runtime matter together.
- Thermal validation is essential under peak discharge profiles.
E-Motorcycle / Mobility
- Suitable for performance mobility packs with correct BMS, fusing, and cooling.
- Parallel count should be based on measured current, voltage sag, and heat rise.
Backup Battery Units
- Designed for high-power backup applications where runtime and recovery behavior matter.
- Use conservative charge/discharge windows for long service life.
Power Tools / Garden Tools
- Strong fit for tools requiring high power and useful runtime in the same pack.
- Validate pack heat rise at sustained current.
Custom Battery Packs
- Designed for experienced builders and integrators who can manage current sharing and heat.
- Requires matched cells, correct welding, insulation, protection electronics, and pack-level testing.
19. Selection Bias: Power vs. Runtime
Product-page positioning for shoppers comparing high-power and high-energy cells.
20. Application Suitability Matrix
Simple product-page fit guidance.
| Hyper EV / racing | Strong fit with validation |
|---|---|
| Drones / eVTOL | Strong fit |
| E-motorcycle / mobility packs | Strong fit with BMS and thermal design |
| Backup battery units | Strong fit for engineered systems |
| Maximum runtime only | Compare against energy-focused cells |
| Unmanaged consumer devices | Not recommended |
Safety, Handling & Compatibility Notice
This product is an unprotected lithium-ion cell. It should only be used by customers who understand lithium-ion cell safety and who are using the battery in compatible hardware, managed packs, or professionally designed assemblies. Improper use can lead to overheating, venting, fire, or explosion.
- Charge only with lithium-ion chargers or managed battery systems designed for the correct chemistry and cell count.
- Never short circuit, crush, puncture, incinerate, or expose the cell to water.
- Do not use cells with damaged wraps, dented cans, or missing top insulator rings.
- Do not mix with cells of different age, capacity, model, or state of charge in the same pack.
- For assembly, use spot welding rather than direct soldering to reduce heat damage risk.
- Store and transport in non-conductive cases; never carry loose cells in pockets or bags.
- Keep away from children and from applications for which the product is not specified.
- Not for e-cigarette, vape, or similar use.
Common technical questions about the Molicel P50B.
What is the capacity of the Molicel P50B?
The P50B has a typical capacity of 5000mAh and a minimum capacity of 4850mAh. The data sheet lists typical energy as 18.0Wh and minimum energy as 17.5Wh.
Is this a 50A or 60A battery?
The current live product title and Molicel data identify the P50B as a 60A cell. The 60A continuous discharge rating uses an 80°C cut-off condition, so pack design must include proper thermal control.
Is this a protected battery?
No. This is an unprotected flat-top 21700 cell and should be used only in equipment or packs with appropriate electrical and thermal protection.
What charger should be used?
Use a lithium-ion charger or battery-management system that uses a CC-CV profile to 4.20V per cell. The standard charge current listed by Molicel is 5A.
Can the P50B fast charge?
Yes. The data sheet lists a 25A maximum charge current with a 70°C cut-off condition, and Molicel describes the cell as supporting a 5C fast charge rate. High-current charging should be used only with temperature sensing and validated pack-level controls.
What is the correct discharge cut-off voltage?
The data sheet states a 2.50V discharge cut-off voltage per cell. Many pack designers choose a higher system cut-off to reduce stress and improve service life.
Can the P50B be used in battery packs?
Yes. It is intended for high-power battery pack applications when cell matching, spot welding, BMS sizing, fusing, insulation, current sharing, and thermal validation are properly engineered.
Can I solder wires directly to this cell?
Direct soldering is not recommended. Spot welding is the preferred pack-assembly method because it reduces the risk of heat damage to the cell.
What are the cell dimensions?
Molicel lists the maximum cell envelope as 21.55mm diameter and 70.15mm height, with a maximum weight of 71g. Always confirm physical fit in the actual device or holder.
What temperature range is allowed?
The P50B data sheet lists -20°C to 60°C for ambient charging and -40°C to 60°C for ambient discharging. High-current use should include temperature monitoring and derating.
Is the P50B better for power or runtime?
It is designed for both high power and high energy. It offers a 5.0Ah capacity while retaining a 60A discharge-current class, making it suitable for premium designs where power-to-energy ratio is critical.
What does 6.5mΩ AC impedance mean?
It indicates very low cell impedance at 30% SOC, which helps support high-current delivery and lower voltage sag. Real pack resistance also includes welds, nickel, busbars, wiring, holders, fuses, and BMS components.
How many cycles should I expect?
The live listing uses a general 1000+ cycle-life statement, and Molicel’s product page highlights improved cycle life under +1C charge / -100W discharge conditions. Actual cycle life depends on temperature, charge current, discharge power, depth of discharge, and pack design.
Can I carry this battery loose?
No. Loose transport is unsafe because conductive objects can short the terminals. Always use a non-conductive battery case.