Molicel P42A 21700 4200mAh 45A Unprotected Li-ion Battery
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There may be slight variations between different batches, the functionality remains the same
The Molicel INR21700-P42A is a high-performance rechargeable lithium-ion battery designed for applications that demand both high current output and reliable energy capacity.
With a typical capacity of 4200mAh (15.5Wh) and a manufacturer-rated 45A maximum discharge current, the P42A delivers an excellent balance of power and capacity in the popular 21700 battery format.
Featuring low internal resistance and high-discharge capability, it is a suitable choice for compatible high-output flashlights and professionally engineered battery systems.
Important: This is an unprotected flat-top 21700 lithium-ion cell without a built-in protection circuit (PCB/BMS).
4200mAh Capacity for High-Power Applications
The Molicel P42A provides a typical capacity of 4200mAh and a minimum specified capacity of 4000mAh.
With approximately 15.5Wh of typical energy, it combines substantial energy storage with the ability to deliver high current when required.
This balance makes it particularly useful for compatible devices that need both high output and practical runtime.
45A Maximum Discharge Capability
The P42A is rated by Molicel for a maximum continuous discharge current of 45A.
Its high-current capability makes it suitable for demanding applications, including compatible high-performance flashlights and power systems.
Actual performance depends on operating temperature, cooling conditions, device design, and battery condition. High-current operation can generate substantial heat and requires appropriate thermal management.
Low Internal Resistance
The Molicel P42A features low internal resistance to support efficient power delivery under demanding loads.
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Typical AC impedance: 10mΩ at 1kHz
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Typical DC impedance: 16mΩ at 10A / 1 second
Low impedance helps reduce voltage drop under load and supports stable performance in compatible high-drain applications.
Rechargeable 21700 Li-ion Cell
The P42A uses a nominal voltage of 3.6V and a maximum charging voltage of 4.2V.
Its standard charging current is 4.2A, with a manufacturer-specified standard charging time of approximately 1.5 hours under controlled conditions.
Use only a compatible lithium-ion charger with appropriate CC/CV charging control.
Unprotected Flat-Top Design
The Molicel P42A is an unprotected battery cell. It does not include an integrated protection PCB or BMS.
This means the battery relies on the connected device, charger, or battery management system to provide appropriate protection against unsafe operating conditions.
The flat-top terminal is suitable for devices specifically designed to accommodate unprotected flat-top 21700 cells.
Before purchasing, verify your device's battery size, terminal requirements, voltage compatibility, and protection requirements.
Do not use this cell in devices that require protected or button-top batteries unless the manufacturer explicitly confirms compatibility.
Key Features
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4200mAh typical capacity
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4000mAh minimum capacity
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15.5Wh typical energy
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45A manufacturer-rated maximum discharge
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3.6V nominal voltage
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4.2V maximum charging voltage
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Low internal resistance for high-current applications
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Standard 21700 cylindrical format
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Flat-top positive terminal
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Unprotected design without PCB/BMS
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Suitable for compatible high-drain flashlights and battery systems
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Molicel |
| Model | INR21700-P42A |
| Battery Chemistry | Rechargeable Lithium-Ion |
| Battery Format | 21700 |
| Typical Capacity | 4200mAh |
| Minimum Capacity | 4000mAh |
| Typical Energy | 15.5Wh |
| Minimum Energy | 14.7Wh |
| Nominal Voltage | 3.6V |
| Maximum Charge Voltage | 4.2V |
| Discharge Cutoff Voltage | 2.5V |
| Standard Charging Current | 4.2A |
| Standard Charging Time | Approx. 1.5 Hours |
| Max Discharge Rating | 45A |
| Typical AC Impedance | 10mΩ (1kHz) |
| Typical DC Impedance | 16mΩ (10A / 1s) |
| Charging Temperature | 0°C to 45°C |
| Discharging Temperature | -40°C to 60°C |
| Maximum Diameter | 21.55mm |
| Maximum Height | 70.15mm |
| Maximum Weight | 70g |
| Positive Terminal | Flat Top |
| Protection Circuit | No – Unprotected |
Specifications are based on Molicel's official INR21700-P42A product datasheet. Maximum discharge capability requires appropriate electrical and thermal management.
Important Battery Safety Information
WARNING: UNPROTECTED LITHIUM-ION BATTERY
The Molicel P42A does not contain an integrated electronic protection circuit. Improper charging, handling, or use may cause overheating, fire, or serious injury.
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Use only in devices specifically compatible with unprotected 21700 lithium-ion cells.
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Use a suitable lithium-ion charger with appropriate voltage and current control.
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Never short-circuit the battery terminals.
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Do not carry loose batteries in pockets or bags with metal objects.
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Always use an insulated battery case during storage or transportation.
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Never overcharge, over-discharge, crush, puncture, or disassemble the battery.
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Do not use cells with damaged wraps, insulation rings, or physical deformation.
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Do not mix cells of different ages, capacities, or charge levels in multi-cell systems.
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Battery packs must incorporate appropriate protection and battery management circuitry.
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Keep batteries away from children.
This battery is intended for users and equipment capable of safely handling unprotected high-discharge lithium-ion cells.
Package Contents
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Molicel INR21700-P42A Rechargeable Li-ion Battery
Quantity depends on the selected purchase option. Charger and accessories are not included unless otherwise specified.
High-Discharge Performance in a 21700 Format
The Molicel P42A 4200mAh 45A Battery combines high-current capability, low internal resistance, and substantial energy capacity in a compact 21700 cell.
For compatible high-output flashlights and demanding power applications, it offers a proven combination of power delivery and energy storage.
Please confirm device compatibility before ordering. This is an unprotected flat-top battery without a built-in PCB.
SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.
For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.
Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.
If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.
Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.
Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.
Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.
Learn more,Please click on Here.
To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.
Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.
Discount products：
No product return for discount products
Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.
Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.
Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty
Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.
Learn more,Please click here.