Efest 4549 IMR 21700 3700mAh 3.7V Unprotected High-Drain 35A Lithium Ion (Li-ion) Flat Top Battery - Boxed
Brand:Efest
Buy more save more!
- Size: 21700
- Voltage: 3.7
- Rechargeable: Yes
- Chemistry: Li-Ion
- Capacity (mAh): 3700
- Terminal Type: Flat Top
$11.00
Recently viewed
Description
Efest IMR 21700 Unprotected High-Drain Lithium Ion Flat Top Battery
3.7V, 3700mAh
High draining and long-lasting, the Efest 4549 IMR 21700 Li-Ion Flat To Battery is the perfect power source for your personal flashlight! This impressive cell features an incredibly stable Lithium Manganese Oxide chemistry, which is able to provide 35 Amperes of current, more than enough to power your highest-draining flashlights. The IMR 21700 has a sizable 3700 mAh capacity, giving you plenty of usage before needing to recharge. The unprotected cell is compatible with rapid chargers, bringing it back to full power in no time!
Features:
- >
- Stable Lithium Ion chemistry
- CE, RoHS, and MSDS Certified
- Comes with Efest's 3 Month Warranty
Specifications:
- Battery Size: 21700
- Battery Chemistry: IMR (LiMn(2O4)
- Nominal Voltage: 3.7V
- Nominal Capacity: 3700 mAh
- Max Charging Current: 4.0A
- Recommended Charging Current: 2.0A
- Estimated Charge Cycles: 500 cycles
- Max Discharge Current: 35A
- Charging Temperature Range: 32°F to 113°F (0°C to 45°C)
- Operating Temperature Range: -4°F to 167°F (-20°C to 75°C)
- Shelf Life: 10 Years
-
Dimensions:
- Length - 0.83" (21 mm)
- Diameter - 2.76" (70 mm)
CAUTION: Unprotected Li-Ion Battery
Unless equipped and 'protected' with a PCB (protection circuit module) and/or similar device, lithium-ion (li-ion) rechargeable battery cells are not recommended by BatteryJunction.com or our parent and associated companies, or the respective manufacturers, as a stand-alone product. Misuse of lithium-ion rechargeable battery cells can pose a serious risk of personal injury or property damage.
Use caution when working with li-ion cells, as they are very sensitive to charging characteristics and may explode or burn if mishandled. Make sure the user has appropriate understanding of li-ion rechargeable batteries in charging, discharging, and assembly before use. Always charge in/on a fire-proof surface. Never leave charging batteries unattended. We are not responsible for damage if there is any modification of the batteries/chargers in any shape or form (including but not limited to pack making). We are not responsible for any damage caused by misuse or mishandling of li-ion batteries and chargers.
No express or implied guarantee of compatibility with any device can be made. Please do your research and make sure this battery is compatible with the item you intend to use it with.
Charge only in a smart charger designed for the specific type of lithium-ion batteries. Do not mix and match old and new, used and unused batteries.
Do not dispose in a fire. Regulations and laws pertaining to the recycling and disposal of lithium-ion batteries vary from country to country, as well as by state and local governments. Please consult your local jurisdiction regarding appropriate disposal. Many retail stores offer free recycling of rechargeable batteries.
No express or implied guarantee of compatibility with any device can be made. Please do your research and make sure this battery is compatible with the item you intend to use it with.
Charge only in a smart charger designed for the specific type of lithium-ion batteries. Do not mix and match old and new, used and unused batteries.
Do not dispose in a fire. Regulations and laws pertaining to the recycling and disposal of lithium-ion batteries vary from country to country, as well as by state and local governments. Please consult your local jurisdiction regarding appropriate disposal. Many retail stores offer free recycling of rechargeable batteries.
Item Details
| Brand | Efest |
| SKU | EFEST-4549 |
| UPC | 6958946202252 |
| Size | 21700 |
| Voltage | 3.7 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 3700 |
| Chemistry | Li-Ion |
| Sub-Chemistry | LiMn2O4 IMR |
| Shelf Life | 10 Years |
| Packaging | Contractor Pack |
| QTY Per Package | 1 |
| California Residents | see Prop 65 WARNINGS |
Specifications
| Size | 21700 |
| Voltage | 3.7 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 3700 |
| Terminal Type | Flat Top |
| Integrated Charge Port | No |
| Max. Discharge Rate | 35 |
Unit Dimensions
| Length | 2.76 in (70 mm) |
| Diameter | 0.83 in (21 mm) |
Certifications & Transport
| Certifications/Standards | CE, RoHS |
Packaging/Shipping Dimensions
| Length | 2.85 in |
| Width | 0.88 in |
| Height | 0.88 in |
| Shipping Weight | 0.17 lb |
Additional Details
| Packaging | Contractor Pack |
| Warranty |
Efest 3 Month Warranty Battery Junction Warranty |
| Return Policy | Return Policy |
Bright Buys
Titanium Innovations CR123A 1600mAh 3V 3A Lithium Primary (LiMnO2) Button Top Photo Battery - Bulk
$1.50
as low as
$1.25
In Stock
- Trusted and reliable; consistently rated as a top customer pick for LED flashlights
- Superior 1,600mAh capacity means longer runtimes and less frequent battery changes
- Optimized for both high and low drain devices
- State-of-the-art automated production lines ensure the highest quality and safety protections
Energizer Industrial EN91 (24PK) AA 1.5V Alkaline Button Top Batteries - Box of 24
$10.95
as low as
$9.65
In Stock
- Ideal for low-drain applications that require a primary battery to provide constant power
- 10-year shelf life - stock up for emergencies!
- The best choice for consistent power, great in low-drain devices like remotes
- Safe and reliable - capable of performing in high or low temperatures
Duracell Duralock DL CR2032 (6PK) 225mAh 3V Lithium (LiMNO2) Watch/Electronic Coin Cell Batteries - 6 Pack Retail Card
$9.00
as low as
$7.60
In Stock
- 225mAh capacity drives long runtimes for watches and electronics
- CR2032 coin cells packed with 3V of power
- Convenient 6-piece retail card provides backup batteries
- Easily replaceable primary lithium cells
- Top recommended battery for Apple AirTags
Titanium Innovations MT11 Survival Tool Card - 11 Tools in One - Black or Silver Stainless Steel
$2.34
as low as
$1.32
In Stock
- 11-in-1 card sized tool fits in your wallet or on a keychain!
- Packed with handy tools including a screwdriver & 7 wrench settings
- Serrated saw and straight-edge knife for quick cutting jobs
- Can + bottle openers for campsite meals or end-of-shift relaxation
Fitorch Lii-M4S 4-Channel Smart Battery Charger for Li-ion, Ni-Cd, & NiMH Batteries
$39.95
In Stock
- Independent 4-slot charging for different batteries
- Touch screen control provides user-friendly operation
- 4 working modes for charging, testing batteries, and more
- Compatible with Li-ion, Ni-Cd, & NiMH batteries
Nitecore QC 3.0 Quick Charge USB Adapter
$9.50
Only 3 Left In Stock
- Quick Charge 3.0 technology enables fast and efficient device charging
- USB compatibility supports a wide range of electronic devices
- Compact adapter design makes it ideal for travel and everyday use
- Intelligent charging management helps optimize power delivery
3-in-1 Universal Charging Cable - with Lightning, Micro-USB, and USB-C
$9.54
In Stock
- Universal cable to consolidate chargers for work, home, or EDC use
- USB-C, Micro-USB, and Lightning plugs for various electronics
- USB-C input with USB-A adapter for use with any USB power source
- 3.93ft long cord, allowing you to use your phone during recharging!
- Premium materials for durability and fast charge speeds
XTAR EDC Universal Flashlight Holster - Fits 24-32mm Diameter and 130-170 Length
$5.94
Only 1 Left In Stock
- Fits flashlights w/ diameter of 24-32mm & length of 130mm-170mm
- Great for EDCs, tactical lights, slim lights, & more!
- Durable and flexible nylon material keeps lights secure
- 33g weight won't drag you down!
Fitorch ER16GT USB-C Rechargeable LED Flashlight - 1350 Lumens - Luminus SFT25 - Includes 1 x 18350 - Black, Green, or Blue
$42.45
Save $7.50
In Stock
- Portable powerhouse - emits a 1148ft beam from a 3.4in light!
- Strobe and SOS modes accessible for emergencies
- Dual-fuel power - swap in a CR123A when needed
- Strong magnetic tailcap for hands-free repair jobs
- USB-C port offers seamless recharging from anywhere!
Fitorch EA25 LED Flashlight - Luminus SST70 - 3000 Lumens - Includes 1 x 21700 with Built-in USB-C Charging Port
$74.95
In Stock
- 3,000 lumens and a 250-meter throw - fierce illumination to light up your backyard
- Multiple output modes are accessible via easy side switch operation
- Strobe, SOS, and beacon modes offer distinct signaling capability
- High-capacity battery supports the light with a maximum 227-hour runtime
