I have order many times from them. Awesome service. Speedy shipping. Great communication. Batteries are superior and high end name brands, they keep my vape devices running for 2 days. My battery go too store. Great prices. I love these guys!!
Key Features
- Extreme Power Output: Rated for up to 45A continuous discharge for demanding applications.
- Large 4200mAh Capacity: Provides long runtime without sacrificing performance.
- Modern 21700 Size: Higher efficiency and energy density than older cell formats.
- Designed for Battery Packs: Unprotected flat-top cell intended for systems with built-in protection.
- Trusted Molicel Engineering: Known for consistency, durability, and high-current reliability.
Overview
The Molicel P42A 21700 battery sets the benchmark for high-performance lithium-ion cells. Combining a 4200mAh typical capacity with a powerful 45A continuous discharge rating, this cell offers an unmatched blend of energy storage and current capability. When used in a properly protected battery pack, it delivers outstanding performance for advanced electronic systems that demand both power and endurance.
Applications / Uses
- High-performance battery packs
- Power tools and industrial equipment
- Portable energy storage systems
- Research, development, and testing
- 21700-compatible high-load electronics
Specifications
| Manufacturer: | Molicel |
| Model: | INR-21700-P42A |
| Size: | 21700 |
| Positive Terminal: | Flat Top |
| Nominal Capacity: | 4200mAh |
| Continuous Discharge Rating (max): | 45A |
| Nominal Voltage: | 3.6V |
| Maximum Voltage: | 4.2V |
| Cutoff Voltage: | 2.5V |
| Protected: | No – requires external protection |
| Approx. Dimensions: | 21.7mm x 70.2mm |
| Approx. Weight: | 67g |
Molicel INR21700P42A Datasheet
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or for e-cigarettes, vaporizers, or similar devices.
-
Thermal Runaway: A chain reaction where heat from a failing battery
causes further overheating, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. Continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger specifically designed for lithium-ion batteries and ensure the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
-
Prohibited Activities:
- Do not expose the battery to extreme heat, fire, or liquids.
- Do not short circuit, puncture, crush, or modify the battery.
- Do not charge or discharge beyond the manufacturer’s voltage range.
- Do not dispose of in regular trash—always recycle at approved facilities.
- Emergency Response: If a cell shows signs of thermal runaway (e.g., smoke, swelling, hissing, or heat), stop use immediately and, if it can be done safely, move it to a non-flammable surface (e.g., concrete or sand) away from combustible materials. Lithium-ion cells burn as Class B fires — use an ABC / dry-chemical fire extinguisher, or douse with large amounts of water to cool the cell and prevent the fire from spreading. Do not rely on a small spray; thorough cooling is required, and cells can reignite from residual heat, so monitor the area afterward. (Class D extinguishers are intended for lithium-metal batteries, not lithium-ion.) For any fire beyond a single small cell, evacuate and call emergency services.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.9 / 5 from 244 reviews.
These 21700 batteries are really living up to their expectation. My legend 2 classic mod blows clouds all day and I only have to charge them every two days they are perfect. You guys also have the best prices for the product and for shipping you guys also have this fastest shipping so I appreciate you guys thank you and keep doing what you're doing. Keep making my friends.
Great packaging as you can see. The best price for batteries and for shipping.
Used 2 Molicell 21700 to make a pack for my FPV controller!
so i had ordered 120 of these a few years back and a couple of my strings were failing so i ordered these as a replacement and they went in and balanced nicely with all of the other cells within the tolerance range and so far are holding voltage well and handling the stress of my high powered emtb
Using these battery for an efoil build 12s4p battery pack. Needed a few extras from my previous order. Battery seem very high quality and all tested very similar in voltages which made my battery build much easier.
These are high quality batteries and work efficiently in my device there very well made
Received order. Packaged well. Zero cons.
Last all day in my Vaporesso Armour S vape.
Works great in my device that is totally not a vape.
Works as expected, no problems
All the cells came nicely packaged and shipped quick. No large delta between any of the cells voltage. Couldn’t ask for a better experience.
Great shipping, item exactly as described! Super happy with their service. Thank you!
Exactly what I needed. Couldnt be happier and super fast shipping! Thank you!
Y'all did great - and thats a fine battery too!
No complaints, excellent!
I love this cuz it’s a good battery
Quick shipping and always solid products!
it works
shipping was excellent and the batteries preform as excepted
Great Product and Service!
Fast shipping and well packaged.
Batteries are working as expected
You know the pricing was fantastic and everything shipped amazingly well and FAST. Building a pack and haven’t had a chance to use them yet—but—I’m 100% sure all will be well!
Great quality batteries. Shipping was very fast. Nothing to complain about.
Great price and excellent shipping.
👍
Everything arrived correctly
Great batteries for home built flight packs for my RC Wing.
Works as intended
Always a great experience with this vendor and products. Great prices as well.
Exactly what I ordered. Fast shipping.
Delivery time was as expected and the batteries work wonderfully. Very happy with the product and the vendor.
Trouble free quick service
Reddit says these are the best batteries. So far, I agree.
Very nicely packaged shipment. Came with single cell cardboard wrappers for resale no use to me. Most cells were at 3.55volts with several at 3.58 and a smaller amount at 3.54. All good so far, 96 cell pack working great.
Good battery would buy again and will when these end up going bad
very good
A very nice battery. I ran several cycles with the batteries I ordered. They all were within specification. They work great in my hank lights.
I’m sure this battery work's just fine in the correct application but why sell or have access to a battery that isn’t compatible with e- cig or vaping products in the same location with all the other batteries that are used for vaping. I understand I’m at fault because I was rushing and didn’t realize this battery isn’t compatible with my vaping device and that could be really dangerous I’m just lucky I actually saw the warning label before something bad happened. All I’m saying is that battery should not be sold or accessible right next to other batteries used for vaping it should have is own category or section