Perfect fit in my portable oscilloscope and multimeter and power last longer after upgrading from the old 2500mah other brands battery power last for days im happy with them.
Key Features
- Large 3500mAh capacity for longer runtime
- Reliable 10A output for consistent performance
- Flat top design for versatile device compatibility
- Stable power delivery from full to low charge
- Designed for dependable, everyday power needs
Overview
The Efest 18650 3500mAh battery delivers dependable power with extended runtime, making it a strong choice for devices that prioritize efficiency and longevity. Its balanced discharge profile and high energy capacity help reduce recharge frequency while maintaining consistent performance.
Applications / Uses
- Portable lighting solutions
- Rechargeable power banks
- Electronics requiring steady output
- Backup power systems
- General-purpose rechargeable applications
SPECIFICATIONS
| Manufacturer | Efest |
| Model | IMR18650V1 |
| Size | 18650 |
| Positive Terminal | Flat Top |
| Nominal Capacity | 3500mAh |
| Continuous Discharge Rating | 10A |
| Nominal Voltage | 3.7V |
| Maximum Voltage | 4.2V |
| Cut-Off Voltage | 2.5V |
| Protected | No |
| Rechargeable | Yes |
| Approx. Dimensions | 18.25mm × 65.25mm |
| Approx. Weight | 46.4g |
⚠ 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 or box.
- 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 use in devices such as e-cigarettes or vaporizers.
-
What is Thermal Runaway?
- A dangerous chain reaction where heat generated by a failing battery causes it to overheat further, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid physical damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases or boxes 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. These are signs of internal damage or instability, and continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger designed specifically for lithium-ion batteries and ensure that the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
- Prohibited Activities: Do not short circuit, modify, puncture, crush, expose to liquids, or solder directly onto the battery (spot weld only).
- Emergency Response: If a cell shows signs of thermal runaway (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 combustibles. Lithium-ion cell fires are Class B fires — use an ABC/dry-chemical extinguisher, or douse with large amounts of water to cool the cell and prevent spread. 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 for lithium-metal batteries, not lithium-ion.) For any fire beyond a single small cell, evacuate and call emergency services.
Disclaimer
IMR Batteries 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 product warnings and safety guidelines are effectively communicated to their customers. Some cells are sold in bulk packaging and are not individually packaged. Resellers must provide appropriate packaging for each individual cell sold and must not distribute cells loose, unprotected, or without a proper storage box or case.
Product compatibility is the sole responsibility of the customer. IMR Batteries does not guarantee compatibility with any specific device or application. We are not responsible for the design, assembly, performance, or safety of any battery pack constructed using our cells. It is the customer’s responsibility to ensure proper cell matching, protection circuitry, configuration, and safe construction practices. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.8 / 5 from 138 reviews.
Excellent batteries for my thermal.
I have always used these batteries! I love them! IMR is my go to when I need new ones. Super easy to order and always arrives quickly. Highly recommend the battery and this awesome business!!
The 3500 is great, but the 3000's seem last longer. I use them for vaping.
amazing quality
Needed new 1's so I bought the best out there ,thanks !
These batteries are great. The charge last for days and it doesn’t take long to charge.
Needed a few to use in my Airvape Legacy Pro
I like them
Thumbs up !
I'm in love with the lifespan of these batteries!!
Recently bought Efest 18650 3500mAh batterirs; they work great!
Arrived fast and just what I ordered!!!
Website is very easy to use and the batteries are a very good priced. I enjoyed ordering from them. I will use them again. And the product is very quality built.
I usually don’t leave comments, it makes me feel like I’m buying and selling the product. That said, I like buying my Efest batteries from IMRbattries.com it’s convenient and the service is great. I know you guys must think I am selling batteries; the fact is I don’t sell any. I buy them in batches paint and date them and when they start spending more time in the charger than in my devices, I give them to my kids. Thank You guys, for offering to sell batteries at a reseller price but I don’t sell. I am including a picture of my Sigelei and SnowWolf collection. That I don’t sell either. Thanks Again, Russ
Good
Great batteries with good uptime.
The efest 3500 mah with the 20amp max 10a constant, is 90% of the life (time from 4.2v down to 3.6v) of the mxjo 3500 mah 20amp burst 10amp constant, but the efest does hit (amp) about 5% harder than the mxjo on a mechanical mod with no chip and dual 4 wrap Clapton's at .14 ohms
Yet again great price and fast shipping
Don’t stay charged that long
Great battery but not grat price
Love these batteries it's the only battery I'll buy for my vapes. Will be ordering more
Good power, though they don't last as long in my one-battery mod as I has hoped they would.
Great battery. Came charged. Preforms better than expected.
Very good price to value ratio. Service is excellent.
As described, quick ship.
Great quality. Longest lasting battery out of the 3 other batteries I own. Will definitely buy more and recommend to anyone who is looking for more vaping time on a single charge.
Best quality batter that I have come across. These are perfect for my application.
These are the best batteries for my need, and the price was much better than elsewhere. (especially if you go with a larger quantity). They carry a good charge, last a long time, and charges fairly quickly. They were packaged well and delivered promptly. Very satisfied with purchase.
100% recomendado la mejor tienda
I use a aegis legend w/Zeus X @65w 130*c and it’ll last me about a day and a half.
Awesome
Batteries are always great
So far the customer really like the Efest 3500mah batteries , bcz it is extremely powerful and unusually slender! Most high mah with high amps are normally wrapped super thick. Which dont fit very well in some of the vape devices we sell! thx, Christy M Musso
Needed 18650s for a custom battery pack for my electric skateboard. The high mah rating was real. After testing I was able to determine the quality of these batteries. The EFEST IMR 18650 is possibly the best on the market.
Great product, price and speedy delivery.
My order came fast!!! I’ve always used these batteries. They haven’t let me down yet.
These are great batteries I've used them all the time
The batteries are great and the service was better!
Great service and shipping was skeptical ordering from them however id do it again. I would like to see order updates for instance when it ships