# Rechargeable 21700 Li‑Ion Battery Fenix ARB‑L21‑5000U 3.6V, 5000 mAh, 76 mm×21.5 mm

**URL:** https://aio.lv/en/product--fenix-910715--11422895
**Data updated:** 2026-01-14 13:14 (EET)
**Category:** Other goods
**Manufacturer:** Fenix
**Manufacturer code:** 910715
**EAN:** 6942870369358
**Warranty:** 1 Year
**Availability:** Available for order
**Price:** 34.49 €
**Prices and availability valid until:** 2026-10-28 23:59
**Price without VAT (21%):** 28.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--fenix-910715--11422895

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.10.2026 | free |
| Pickup points | 16.10.2026 | 1.99 EUR |
| Courier delivery to door | 16.10.2026 | 4.99 EUR |

## Summary description

Fenix ARB‑L21‑5000U — rechargeable 21700 lithium‑ion battery with nominal voltage 3.6 V and 5000 mAh capacity. Dimensions: 76 mm height and 21.5 mm diameter; weight 72.5 g. Designed for high‑capacity power delivery in flashlights, portable electronics and devices that accept 21700 cells. Provides long runtime and reliable performance for demanding use.

## Long description

Fenix ARB-L21-5000U is a rechargeable 21700 lithium‑ion battery with a nominal voltage of 3.6 V and a rated capacity of 5000 mAh. With a height of 76 mm, diameter of 21.5 mm and a weight of 72.5 g, this cell is intended for devices that accept 21700 format batteries, offering extended runtime and stable power delivery for high‑drain flashlights and portable electronics.
Advantages
This rechargeable 21700 Li‑Ion battery delivers a high usable capacity of 5000 mAh in the 21700 form factor, providing longer operating time compared to smaller cells. The nominal 3.6 V voltage supports consistent output for devices designed around lithium‑ion cells. The cell is built to fit standard 21700 compartments and balances energy density with manufacturable dimensions to maintain compatibility with many flashlights and power tools. Lightweight construction and stable chemistry contribute to reliable performance during continuous use.
Suitable for
High‑output flashlights and tactical lights
Portable power banks and battery packs designed for 21700 cells
Handheld electronic devices requiring long runtime
Some e‑bikes, power tools and hobby devices that accept 21700 cells
Key specifications
Cell type: rechargeable lithium‑ion (21700)
Nominal voltage: 3.6 V
Rated capacity: 5000 mAh
Height: 76 mm
Diameter: 21.5 mm
Weight: 72.5 g
How to use
Install the battery into devices that explicitly support 21700 lithium‑ion cells, observing correct polarity and fit. Use a compatible charger designed for lithium‑ion chemistry and adhere to the charger's instructions for charge current and termination. Avoid inserting the cell into devices that require protected or differently sized cells. Monitor the battery temperature during charging and discharging and allow it to cool if it becomes warm to the touch.
Usage recommendations
Store the battery in a cool, dry place away from direct sunlight and heat sources. Charge the cell with a dedicated lithium‑ion charger and do not exceed recommended charge current. Do not expose the battery to mechanical shock, short‑circuiting, or water. Replace the cell if it shows signs of damage, swelling, or diminished capacity. Follow manufacturer and device safety guidelines for safe handling and disposal of lithium‑ion batteries.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.0725 kg |
| Battery technology | Lithium-Ion (Li-Ion) |
| Battery type | Rechargeable battery |
| Battery capacity | 5000 mAh |
| Height | 76 mm |
| Product colour | Black, Yellow |
| Diameter | 21.5 mm |
| Battery voltage | 3.6 V |
| Battery recharge cycles (max) | 500 |
| Power protection features | Overcharge, Overdischarge, Short circuit |
| Battery size(s) | 21700 |

## FAQ

### How much does the Fenix ARB‑L21‑5000U 21700 Li‑Ion rechargeable battery cost, and is it available for purchase?

The price is 34.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.10.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Fenix products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Fenix service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11422895/66179627_large.webp