Fenix ARB-L18-3500 Rechargeable 18650 Battery

(106 customer reviews)

$32.00 $21.95

SKU: ARB-L18-3500 Categories: , ,

The Fenix ARB-L18-3500 is a high capacity 18650 Li-ion rechargeable with a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. The battery also includes pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion.

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Specifications of the ARB-L18-3500 Rechargeable 18650 Battery

  • ARB-L18-3500 Rechargeable Battery
  • 3500mAh high capacity
  • Protection circuitry to prevent short circuits
  • Pressure vents to prevent explosions
  • 500 charge cycles
  • Voltage: 3.6V
  • Charging Current: Recommended 1A, maximum 2A
  • Weight: 1.8 ounces (50g)
  • Size: Length: 2.7″ (69mm) Diameter: 0.7″ (18.6mm)
  • Warranty Period: 12 month from date of purchase

106 reviews for Fenix ARB-L18-3500 Rechargeable 18650 Battery

  1. Jack (verified owner)

    Great service and great products!

  2. Cecelia B. (verified owner)

    Strong and good size

  3. John Morgan (verified owner)

    holds a charge for a very long impressive time period

  4. Ryan S. (verified owner)

    Good Battery

  5. Sue J. (verified owner)

    Great product.

  6. Anonymous (verified owner)

    Always good to have a good dependable Battery Backup.

  7. MIKE CAMERON (verified owner)

    dependable and reliable

  8. Robert (verified owner)

    Great battery with a lot of capacity.

  9. keith (verified owner)

    Good battery. No complaints

  10. Andrew (verified owner)


  11. Steven H. (verified owner)

    Love it.

  12. Richard Pawl (verified owner)

    Happy with my 1400 lumen hard hat light. It’s better than anyone else’s. And having that spare battery I bought from you gives me added confidence because the batteries are already good and don’t drain too fast like a stupid ass streamlight. My next purchase will be a tactical flashlight like your 3000 lumen model. Can you give me a good deal on this?

  13. Joshua N. (verified owner)

    Great flashlights need great batteries. Love the individual plastic containers they came in, much more convenient than the previous method of shipping in foam.

  14. Larry N. (verified owner)

    Upgraded battery for my first UC35.

  15. Wilbur Andrews (verified owner)

    Shipping is too slow, several times slower than Amazon. I get Amazon in two days. Fedex takes over a week – that’s bad

    • Dianne

      Please note your order for this item was placed on a Sunday. Our employees have weekends off. We work standard M-F hours so that we can time with our family and friends on weekends. Your order shipped on Monday. You choose the free shipping option, which explicitly states 3-5 business days. This ships via USPS, which, due to COVID is occasionally taking longer. Regardless, your package was delivered to you on Friday, 4 days after it left our facility and within the 3-5 day range we provide. It left our facility on the first working day after you placed your order. However, once it leaves our facility, which it did rather quickly, it is out of our hands on how long it takes the USPS to deliver the package. They do have a note on their website that states “ALERT: DUE TO LIMITED TRANSPORTATION AVAILABILITY AS A RESULT OF NATIONWIDE COVID-19 IMPACTS, PACKAGE DELIVERY TIMES MAY BE EXTENDED” We do have paid options for expedited shipping.

  16. Anthony (verified owner)

    Charges easily in or out of my hm65r headlight. Charge last along time.

  17. Robert Guffey (verified owner)

    Love the Battery

  18. John Ashley (verified owner)

    Works great

  19. Randy M. (verified owner)

    perfect, easy to operate, battery long lasting, great choice

  20. Darrel Crossman (verified owner)

    super lighting and area coverage.

  21. Dan C. (verified owner)

    10,500mAh in the CL30R Lantern provides power to spare!

  22. John Caskey (verified owner)

    Great battery for edc backup carried in battery locker

  23. Bruce Baumel (verified owner)

    Illuminating your lighting requirements is dependent on an excellent power source and Fenix is that source.

  24. Ryan (verified owner)

    Nice batteries and long lasting.

  25. Rod Ferguson (verified owner)

    Good battery and light

  26. Bob Chauncey (verified owner)

    Also nice and easy to charge, but need charger, while Fenix ARB-L18-3500U has port to charge and likely easier to do.

  27. Bradley Rogers (verified owner)

    Good to have as a backup power source on rechargeable headlamp.

  28. Anonymous (verified owner)

    Great battery..

  29. Melissa M. (verified owner)

    I got tired of seeing all of the weird knock off replacement batteries on Amazon, so I came back to Fenix and was excited to see that there is a rechargeable battery for my PD35. So excited and pleased with this!

  30. Wendy Osborn (verified owner)

    Package came opened, battery will not hold a charge. Emailed asking for a resolution, they never responded 🙁

    • Dianne

      I have asked warranty to contact you. That’s really odd.

  31. Myles Rogers (verified owner)

    I thought it had a teceptical on battery for charging

  32. Thomas (verified owner)


  33. Al (verified owner)

    I had a problem with my new fenix headlamp. The company immediately sent me a new one and I was so impressed I bought the higher capacity battery to go with it. Both are working perfectly. Couldn’t be happier.

  34. Anonymous (verified owner)

    I have four Fenix lights using the 18650. Two TK’s, a lantern, and an HM65R headlamp. I love having a one battery system. A double charger which keeps the batteries, but that only comes out once or twice a month as the 3400/3500 mAh batt’s last for a while! Overall this is an excellent unit.

  35. David D. (verified owner)

    Love it

  36. Chris A. (verified owner)

    The two batteries that were purchased have done there job and more I no longer have to be carrying around a hand full of regular C123 Batteries. They work great.

  37. David B. (verified owner)

    Good batteries, they provide plenty of power and last a long time.

  38. Tim C. (verified owner)

    Long life, works great

  39. Michael M. (verified owner)

    The contact on the phone was very helpful even though my light was not bought from their site. I chose to buy the battery instead of the hassle of warranty from another vendor. I will buy Fenix again, but only from their site for the great service

  40. BRIAN CAMBRIA (verified owner)

    so far, so good

  41. Brian Aldouri (verified owner)

    Nice batteries

  42. Jeff (verified owner)

    Exactly what I ordered. Fast delivery. Thank you.

  43. John E. (verified owner)

    Nice to have a backup battery, especially with a good capacity. Came with a nice battery case that will connect with another similar one.

  44. Diego (verified owner)

    Good quality

  45. Stan Lake (verified owner)

    Awesome long lasting battery

  46. Anonymous (verified owner)


  47. Anonymous (verified owner)

    Could be better

  48. Ryan C. (verified owner)

    Its a battery that works as expected. WIll be purchasing more.

  49. Anonymous (verified owner)


  50. Jack U. (verified owner)

    Top-of-the-line battery!

  51. John E. (verified owner)

    Good capacity! Nice to have a backup battery!

  52. Thomas (verified owner)

    Fenix batteries and chargers nothing else makes any sense.

  53. John E. (verified owner)


  54. Terry (verified owner)

    The best Ah.

  55. Donald (verified owner)

    Wanted xtra long battery life between charges.

  56. Artec (verified owner)

    Long-life battery works well

  57. Henry Jarnagin (verified owner)


  58. Joseph Elias (verified owner)

    Battery is awesome. Holds a charge for a long time

  59. Anonymous (verified owner)

    This is number 5 or 6 that I’ve order batteries for my flashlights. All good. they last a good long time. They are reliable. The chargers are first class. Have not reached the logical ending for any of the batteries yet.

  60. ANTHONY R. (verified owner)

    Great battery, lasts all day, charges over night, has never failed me

  61. Tom S. (verified owner)

    Didn’t know this has a charging port.

  62. stephen ricard (verified owner)

    So far so good

  63. Barry Kitchens (verified owner)

    Worked as advertised

  64. Michael McKee (verified owner)

    Wish the batteries came with a protective case; however, they have a long battery life and well worth the buy.

  65. Jonathan T. (verified owner)

    Great Batteries last longer and brighter then the 2500 . I recommend these 3500 batteries.

  66. Chris T. (verified owner)

    works perfectly!

  67. Tim H. (verified owner)

    The battery and the charger were shipped and received promptly. I have used the flashlight with the rechargeable battery throughout each work day for the past two weeks and both the battery and the charger have exceeded my expectations! I’m very pleased and highly recommend these Fenix products!

  68. RICARDO LOPEZ (verified owner)

    your products are the best in the world, Thanks for being present in this World Thank you

  69. Robert G. (verified owner)

    The PD35 reaches it’s full potential with this battery.

  70. Britton L. (verified owner)

    Lasts long

  71. Ray Walter (verified owner)

    Very good battery.

  72. David G. (verified owner)

    The Fenix flash light with these batteries are great. I us them for work everyday

  73. Steven N. (verified owner)

    Great product

  74. KYLE (verified owner)

    its great

  75. Doug D. (verified owner)

    I’ve had no issues with the 3500mAH rechargeable battery. I seem to get a nice long charge from this battery everytime I use it.

  76. Jeffrey Obermeyer (verified owner)

    Great value

  77. Michael (verified owner)

    Powerful long lasting

  78. Mark Kuivenhoven (verified owner)

    It’s a battery it’s working

  79. Samuel Shearer (verified owner)

    PD35 with rechargeable Lithium Ion batteries is about one of the most useful tools I own. Everyday without fail, quality light when I need it, Thanks

  80. Jeremiah Prunty (verified owner)

    Bought as a spare.

  81. Anonymous (verified owner)

    A high quality long lasting battery

  82. Miguel G. (verified owner)

    Holds a long charge

  83. Anonymous (verified owner)

    Lot of power

  84. Bill M. (verified owner)

    Perfect upgrade for my EDC UC30 light.

  85. Anthony (verified owner)

    Great battery. Keeps turbo working for a long time.

  86. Steven C. (verified owner)

    Charges fast and powers the lamp perfectly.

  87. James W. (verified owner)

    Bought an extra to have on hand.

  88. Thomas O. (verified owner)

    works great

  89. Thomas Drake (verified owner)

    Absolutely spectacular, i am one happy customer. Always I like to have the best product and being a search & rescue member my life and the life of others depend on me being as good as the product I use in the field to be the best. I have tested a lot of batteries and these by far are the best.

  90. quincy (verified owner)

    Last a lot longer than the throw away batteries.

  91. Jeffrey Barnette (verified owner)

    Very good Batteries.

  92. Bill Magoon (verified owner)

    Bought simply as a back up battery. Have not used it yet but am sure it will be fine.

  93. Sajad Salehi (verified owner)

    One of the best battery I’ve ever had

  94. David C. (verified owner)

    Perfect battery!

  95. John J. (verified owner)

    Very fast shipping. Thank you!

  96. SHUBHRA (verified owner)



    Very good battery – works as advertised. 3500mah is definitely the way to go

  98. Wayne (verified owner)

    These batteries provide a uniform and reliable power output for my Fenix lights. I use these in a variety of Fenix products including headlamps, regular flashlights and camping/utility lights. This is my preferred battery since it provides the longest run time.

  99. Matthew K. (verified owner)

    Great battery! Long lasting!

  100. John J. (verified owner)

    Works as advertised. It is a bit pricy compared to other 18650’s on the market. But at least with Fenix, I know that I’m getting a good product

  101. Timothy M. (verified owner)

    I wasnt sure that this w/b an improvement over the 2600mAh, but it is! Worth it

  102. Eric M. (verified owner)

    I own a termite inspection company and so I have many Fenix flashlights and accessories. These are the best and brightest flashlights we have ever used and very durable. The batteries last a very long time as we use professionally 5 days a week. When we do need service they stand behind the product. I could not more highly recommend this product.

  103. Anonymous (verified owner)

    They seem to hold up pretty well. I haven’t really had time to put these batteries through the wringer yet…

  104. EZRA (verified owner)

    Excellent battery.

  105. Sergeant Frank C. (verified owner)

    Solid purchase.

  106. Paul Carroll (verified owner)

    Outstanding battery. I’m buying some for my coworkers

  107. Richard

    I can’t say enough about the charger. I expected a plastic step-on-me-once-and-I’m -dead charger. This thing is tough! I don’t know what it is made out of but I am so impressed I’m getting one for my step-son.
    I use mine (HL60R) professionally (daily) and made the mistake of taking it goose hunting once and my step-son really loved it. He got one for Christmas and now getting a charger. Inexpensive and sturdier than any charger I have ever purchased at any price.

  108. Tommy B in Dallas

    Friends gave me a Fenix UC40UE tactical light for my birthday, and I am hooked on Fenix Quality. Just returned from a 12 day elk in the Wyoming back country and this light was outstanding, while using the FENIX 3500 amh rechargeable batteries. 900 Lumens from this small compact light it awesome!! Outstanding quality!! I just ordered the new version of the TK75 and cannot wait to get my hands on this one. Fenix service is also outstanding and they are always helpful when I call…. helpful and full of the correct information! Keep up the good work! Fenix quality is second to none!!!!

  109. Kevin (verified owner)

    Just got the batteries, they look good and are charging now. This review is primarily for the Fenix brand and level of service. I ordered two of these batteries and a two Bay charger. When I received the order there was a 4 Bay digital charger and a note stating that they were out of stock on the two Bay and to please accept the free upgrade. I am highly impressed, Fenix didn’t have to do that but rather than make an ordeal out of it they not only got me what I needed but gave me more than I had asked for. I appreciate this greatly as I am going camping in a few days and don’t have time to order another from somewhere else without having to pay overnight shipping. Fenix quality is outstanding and they’re service to customers matches it. Im now a customer for life

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