Very .very good
Key Features
- High-capacity 3500mAh cell for extended runtime
- 10A maximum continuous discharge capability
- Flat top, unprotected design for broad compatibility
- Stable voltage output across discharge cycles
- Low cut-off voltage to support battery longevity
Overview
The Efest 18650 3500mAh Flat Top battery is engineered for applications requiring steady energy delivery and extended operating time. With a high nominal capacity and controlled discharge characteristics, this lithium-ion cell provides reliable performance while maintaining voltage stability throughout its discharge range.
Applications / Uses
- Portable power packs
- High-efficiency flashlights
- Battery pack assemblies
- Rechargeable electronic equipment
- DIY and professional power projects
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 (Unprotected) |
| 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.
- 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: 4.8 / 5 from 99 reviews.
My vape store doesn’t carry Efest any more and it makes me sad. So I know what to do now!
Great batteries for my vape, fast shipping, nothing bad to say
Arrived as described
Excellent quality
It’s ok
Great battery, great price and fast shipping.
We needed these, our old 1860s were struggling. Nice to have new all matching quality efest for vaping.
Thank you for the great experience
Great batteries! I'll definitely be ordering more.
will order again
Great Service.
Fast service and provided what I ordered
Great. Thanks
Great batteries. 18650 Store is the best. Great prices and speedy shipping!! Thanks!!!
Just as ordered and shipped out right away. Even with a product that has to be shipped ground. The order was delivered in no time at all.
yes.
Works great
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.
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.
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.