Molicel INR-21700-P42A – 4200mAh 45A Flat Top Lithium Battery

The Molicel/NPE INR-21700-P42A is a flagship “power” 21700 cell designed for serious current draw without sacrificing runtime. Delivering a manufacturer-rated 4200mAh capacity and up to 45A max discharge, it’s a go-to choice for high-drain devices that demand both punch and endurance. With flat-top, unprotected construction and precise dimensions, it fits gear built for true 21700 cells—while Molicel’s reputation for reliability keeps performance consistent from pack to pack.

4200mAh High-Capacity Runtime

With a rated 4200mAh, the P42A stretches time between charges while maintaining voltage under load. That extra headroom is noticeable in devices that cycle frequently or run extended sessions.

45A High-Drain Performance

The P42A’s manufacturer-rated 45A max discharge supports demanding bursts where lesser cells sag. It’s tuned for performance-class applications—always respect your device’s limits and thermal guidelines.

Genuine Grade A, Factory-Approved Sourcing

These are authentic, Grade A cells from approved channels—unused and batch-tested for consistency—so you get dependable performance instead of lottery results from gray-market “OEM” stock.

True 21700 Fit, Flat-Top (Unprotected)

At ~21.4mm diameter and ~70mm length, this is a proper 21700 form factor. The flat-top, unprotected design suits devices engineered to manage the cell safely while enabling higher current delivery.

Stable INR Chemistry & Rated Voltages

Nominal 3.6V and 4.2V peak align with mainstream Li-ion INR specs, making charger and device pairing straightforward—provided you use a quality Li-ion charger designed for this chemistry.

IN THE BOX

•  1× Molicel/NPE INR-21700-P42A 21700 Flat-Top Battery (Grade A, unused)

• Sold individually; order quantity = number of cells.
  

FAQ

Is this a protected battery?


No. The P42A is an unprotected, flat-top cell. Use only in devices designed to accept unprotected 21700 cells and that provide appropriate protections.

What devices is it compatible with?


Any device that explicitly supports 21700 flat-top cells and high-drain operation. Always check your device manual for size, contact style, and current requirements.

What’s the maximum discharge rating?


Manufacturer-rated 45A max discharge. Never exceed the lower of your device’s limit or the battery’s limit. Monitor temperature and follow safe-use practices.

How should I charge it?


Use a high-quality Li-ion charger compatible with INR 21700 cells. Charge to 4.2V only. Do not charge unattended.

How should I store it?


Store in a cool, dry place at ~3.5–3.7V if not used for weeks or longer. Use a non-conductive protective case during storage and transport—never loose in pockets or bags.

Does it include a case or accessories?


No. The cell is sold in a protective cardboard box. We recommend adding a plastic protective battery case.

Is this cell authentic/Grade A?


Yes—these are genuine, Grade A cells sourced through factory-approved channels and checked for consistency.

Any safety tips?

• Never short positive to negative

• Do not exceed device/battery ratings

• Keep away from heat and damage; recycle if dented, hissing, or swelling

• If a cell overheats, isolate it immediately; if it ignites, follow FAA guidance (water/soda to cool and control surrounding area, or use a suitable extinguisher)

Key specs recap?

• Size: 21700 (≈21.4×70mm) · Flat-Top · Unprotected

• Capacity: 4200mAh (4100mAh min standard)

• Max Discharge: 45A (manufacturer-rated)

• Voltage: 3.6V nominal / 4.2V peak

• Origin: Taiwan

Battery Warning

Warning: Lithium ion batteries may explode or burn due to improper use. Using these batteries for purposes not intended by the manufacturer, including outside a battery pack and/or without a BMS, may cause severe injury and damage. We are not responsible for any injuries caused by lithium ion batteries - use at your own risk.

All rechargeable batteries have inherent risks under any circumstance. Use caution with working with li-ion batteries (lithium-ion), LiPo (lithium ion polymer), and any rechargeable cells (together "rechargeable batteries"), as they have dangerous charging characteristics and are known to explode or burn if mishandled. A purchaser and user of rechargeable batteries should educate themselves on rechargeable batteries, especially as to charging, discharging, assembly, and storage. Learn more about proper storage and care for rechargeable batteries here. We are not responsible for any damage caused by the misuse or mishandling of rechargeable batteries.