Localisation
Form is being processed

Fenix rechargeable battery 18650 3400mAh (Li-Ion)

19.90 
RRP 19.99 
In-store pickup
Today from 12:38 Check availability
chevron_forward
delivery_truck_speed
By courier to your home Delivery by courier DPD Delivery by courier GLS
Delivery method on Tuesday 14.07.2026
location_on
At pick-up points
Delivery method on Tuesday 14.07.2026
replay
Extended return option up to 100 days More info

Premium rechargeable batteries Fenix 18650 3400mAh (ARB-L2S) with protection electronics (protected) are based on premium NCR18650B cells from Panasonic with improved LiNiCoO2 technology, which brings higher safety and longer life. Li-ion rechargeable batteries are characterized by very high capacity, do not suffer from memory effect or self-discharge. Li-ion in size 18650 are the best choice in terms of stored energy with regard to the dimensions and weight of the accumulator.

Fenix accumulator protection consists of internal safety mechanisms and protection electronics. Added electronic circuits prevent overcharging of the cell, its excessive discharge, and against short circuits or excessive current draw. If the battery electronics assess that the limit values have been reached, it safely disconnects the cell.

Internal protection consists of a separator, overheat protection (PTC thermal protection), and a special anti-explosion valve. In case the gas pressure in the cell exceeds a certain limit, the internal separator disconnects the electrodes inside the battery, thereby de facto interrupting the exothermic reaction, and the anti-explosion valve releases the overpressure of gas outside the accumulator. Thanks to the combination of electronic and mechanical (thermal and pressure) protection, Fenix batteries are among the safest available Li-ion accumulators.

With its size, the 18650 accumulator roughly corresponds to two CR123A lithium batteries, which is why it is often used in flashlights as a rechargeable alternative to these primary cells. First, check if your device supports this cell. 18650 3400 mAh accumulators are primarily intended for Fenix TK35 UE V2.0 LED flashlights, but also for other Fenix LED flashlights E28R, E30R, PD32 V2.0, PD35, TK11 TAC, TK16, TK25 UV, TK25 FD41, LD30, SD11, SD20. Fenix HM60R, HM61R, HM65R, HM65R-T headlamps, CL26R, CL30R lanterns, and Fenix BC21R and BC30 bike lights.

Caution, due to the length of 70 mm and diameter, it may not fit into some older models – for example, Fenix PD31, TK11, TK21, TK30.

Fenix 18650 3400mAh accumulator parameters

  • Nominal voltage: 3.6 V
  • Capacity: 3400 mAh, tested with a discharge current of 0.2C ending at 2.5V and a temperature of 25°C
  • Maximum current draw: 2C (6.8 A)
  • Maximum charging current: 0.8C (2 A)
  • Dimensions: 18.5 mm (diameter) x 69 mm (length) (+/- 0.5 mm)
  • Weight: 49 grams
  • Protection against overcharging, complete discharge, and short circuit (>6 A).
  • Lifespan over 500 charging cycles
  • Recommended operating temperatures: 0-45°C (charging), -20 to +60°C (discharging)
  • Package contents: one Fenix 18650 3400mAh accumulator (ARB-L18-3400).

Recommended chargers

Fenix ARE-A2 charger
Fenix ARE-A4 charger
Fenix ARE-D1 USB charger
Fenix ARE-D2 USB charger
MC1 Mini USB charger
SC1 USB charger
FC2 Dual-channel USB charger
Lii-100 USB charger
Lii-500S charger
Lii-600 charger
VC8 Eight-channel USB charger
SkyRC MC3000

Notice

  • If you are using an older charger purchased around 2014, first check if it fits accumulators with a length of 69-70 mm.
  • Do not discharge the accumulator below 2.5 V if possible
  • Do not short-circuit the accumulator (do not connect the cell poles with a conductor)
  • Do not throw the accumulator into fire or water
  • Never insert the accumulator into the charger incorrectly (reversed polarity)
  • When using the accumulator, follow safety regulations
  • Use only an adequate charger that supports Li-ion accumulators

Warranty

Statutory two-year warranty.


Capacity: 3400mAh
Weight: 49g

Product details
product ID 155366
Product rating  (0 ratings)
0/5
(0 ratings)
(0 ratings)
(0 ratings)
(0 ratings)
(0 ratings)
(0 ratings)

How do you rate the product?
Add a review
Help others, earn points and shop better prices thanks to the loyalty program
Product questions

There are currently no questions

Form is being processed
Fenix is a recognized brand in the field of lighting, known for their high-quality and reliable products. Founded in 2004, Fenix has built a solid reputation for manufacturing a wide range of flashlights, headlamps, lights, and other lighting solutions for a variety of outdoor, tactical and everyday uses. With their commitment to innovation, durability and reliability, Fenix has become a trusted name in the lighting industry.

All the answers to questions about delivery, payment, security, returns, warranty and much else.

You can try these searches
You may find these products complementary
Why shop with us?
Find out what makes us special
1 500 000+ orders

We are the largest cycling e-shop in Slovakia, verified by 100,000+ customers.

Unique customer service

We are available via e-mail, online chat, phone or in person at our MTBIKER stores.

We actively support the cycling community in Slovakia

Thanks to your order we can support cycling development.

Secure payment methods

The payment process is safe and we offer you a wide range of options.

Loyalty program

We will reward you for your purchase and also for quality contributions in the MTBIKER forum, e-shop, trips and photo gallery.

MTBIKER centre and showroom

Visit our store with a pump-track and trail access or our showroom in a historical bulding in central Bratislava.

navigate_beforeprevious navigate_nextďalší
keyboard_arrow_up