Welcome back! We saved your shopping cart for you: View Cart
This Item is Discontinued, however these items are available:

Efest 3858 14500 800mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Boxed

Click to Enlarge Image
Save 10%
| Reg. Price $4.60
Usually ships the next business day
This item is Discontinued

Request a Volume Quotation

Battery Junction 30 Day Warranty
Every Order Ships Directly From The United States
Authorized Dealer For All Products Sold
Battery Junction Wholesale Account Signup
Battery Junction Free Keylight On Purchases Over $20 Promo

Efest 14500- Button Top

Efest IMR 14500 batteries are perfect for devices like electronic cigarettes, vaporizers and more. These Efest 14500 batteries are button top terminals which fit securely in most electronic cigarette models as well as many high powered LED flashlights. The IMR chemistry makes them a safer option for your electronic cigarette or vaporizer compared to other batteries. Since they use safer chemistry, they do not require a built-in protective circuit like ICRs do. The Efest 14500 is a great choice if you're looking for a reliable and long-lasting power source.

  • Chemistry: Li-Ion
  • Voltage: 3.7V
  • Battery size: 14500
  • Capacity: 800mAh
  • Estimated charge cycles: 500
  • Diameter: 0.55" (14.15mm)
  • Height: 2.01" (51.05mm)
  • Weight: 1.94 oz (55g)
  • Button Top
  • Protected Cell

Battery Size:14500
Battery Capacity (mAh):800
Battery Chemistry:Li-Ion
Battery Voltage:3.7
Battery Terminal Type:Button Top
Battery Shelf Life:3 Years
Product Certifications:CE, RoHS
Warranty:Battery Junction 30-Day Warranty
Return Policy:Battery Junction Return Policy
Product Weight:1.94oz
Product Dimensions:2.01" (L) x 0.557" (Diameter)
Country of Origin:CN
Associated Battery Sizes:14500, AA, Lithium-Ion AA

Efest doesn't provide public datasheets.

4 Reviews
25% (1)
25% (1)
25% (1)
25% (1)
0% (0)
By Don
Size is different
October 2, 2017
Be careful when buying these as protected batteries are bigger than unprotected. They won't fit in my mod.
ConsSize is different than traditional 15400 due to the protective wafer and wire on the outside of the battery.
Roselle, IL
May Not Connect in your Light
December 31, 2016
Bought this Efest because of the capacity and price, taking the risk of compatibility. Note that "Branded" cells (that is, of OEM flashlight manufacturers) of various cell types are at a premium in price, but that premium suggests full compatibility to the makers' flashlights. In this case I've purchased 14500's from Efest, Xtar, and Jetbeam. I found that the insulated disk at the positive button of the Efest cell seems a bit higher than that of Xtar's or Jetbeam's. This cell would not work in either of my Jetbeam Jet-1-Mk lights, although it did work in my Jetbeam H10A headlamp... mechanical dimensions are important. Some cells are longer, and may fight you in assembly; some are thicker, resisting insertion. This is why I've made a practice of always buying at least one of the cells that is branded by the light maker. The Jetbeam and Xtar 14500's both worked properly in my Jetbeam Jet-1-Mk lights.
Another compatibility issue I noted with this cell (and the other 14500 cells: the Nitecore i2, 2 channel charger I have will not charge any of the three maker's 14500 cells. My Olight UC Universal charger, however, has no such problem. Once the 14500's are charged and used for a time, then i2 can charge the cells. Only time will tell about service life and cycle life of the Efest 14500 800mAH cell compared to branded types and the Efest claims.
Question is, do you feel lucky?
ProsGood Battery Junction price Good capacity, service life, and cycle life claims - but only time will tell
ConsConstruction detail at button may prevent connection in some lights depending on their method of mechanical polarity reversal protection This cell, like other 14500's, may have trouble charging in certain charger brands
Roselle, IL
Good Battery Junction Value for CERTAIN 14500 Capable Lights
December 21, 2016
The Efest 14500 on initial use appears a good, dependable value for lights able to use these cells. Other reviews support this observations, but only time will how the service life and cycle life will fare for this brand. Not every Light will accept certain cells - I found that JetBeam's Jet 1 MK would not accept the Efest cell, apparently due to the design of its mechanical polarity reversal protection at the head and the Anode (positive button areas) insulation design of the Efest, while JetBeam's H10A right angle light did accept the Efest. Note that 14500's from JetBeam and Xtar (I've no other brand as yet) did work in the JetBeam Jet 1 MK. This situation points out the buyer beware nature of Lithium Ion cells from brand to brand and the importance of reviewers observations.
ProsCell cost Cell capacity
ConsLong term service and cycle life yet to be demonstrated Fit for YOUR light not guaranteed
By Paul
they are too long for the Klarus Mi7 Mini-Might EDC Flashlight very tight fit
July 22, 2016
Very good battery just make sure your LED can handle it because of the 4.2 volt
There are no questions or answers for this item.

Efest 3858 14500 800mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Boxed

  • $4.14
  • & Free Shipping On Orders Over $50
  • In Stock