Fenix ARE-X1 V2.0 Charger: Battery Compatibility FAQ
By Fenix Flashlights | World Leader in Fenix® Sales | Fenix Lighting USA | Published: 2026-11-04
Category: Tips & Care
Which cells fit, how USB-C charging and discharging work, and what the LED and protection circuits tell you before you plug in a Fenix battery charger.
Quick answer
The Fenix ARE-X1 V2.0 charges one 18650, 21700 or 26650 li-ion battery at a time over USB Type-C, and it can also discharge a cell to power other devices. If your flashlight uses one of those three sizes, this single-channel charger covers it; for other chemistries or sizes, check the cell label before buying.
One channel means one battery at a time
The ARE-X1 V2.0 is a single-channel charger, so it fills one cell per session. That suits flashlight owners who rotate a spare 18650 or 21700 rather than a photographer charging four cells overnight. If you routinely charge several batteries together, plan on a multi-bay charger instead, or accept that each cell waits its turn.
Why the discharge feature changes packing
Because the charger supports discharging as well as charging, a charged spare cell can double as a small power bank for other devices through the same USB Type-C connection. That is useful on trips where you already carry a flashlight battery and would rather not add a separate power bank. The trade-off is that draining a cell this way leaves it empty for the light until you recharge it.
Where compatibility questions usually come from
Most mismatches trace back to cell size or chemistry, not the charger itself. The ARE-X1 V2.0 is built around li-ion cells in 18650, 21700 and 26650 sizes; a different chemistry or a cell outside those sizes is not covered by the supplied specifications, so treat it as unsupported rather than experimenting. Protected versus unprotected cells and exact length tolerances are also not stated in the catalog, so test fit before relying on a new cell.
ARE-X1 V2.0 compatibility questions answered
- Which battery sizes can I charge?
- Use 18650, 21700 or 26650 li-ion cells. These are the sizes the charger is built to handle; if your cell label shows a different size or chemistry, do not assume it will work. Read the cell wrapper before inserting it, not after.
- Can I charge more than one battery at once?
- No. The ARE-X1 V2.0 is single-channel, so it takes one cell per charge cycle. For multiple cells, charge them one after another or use a multi-bay charger.
- How do I use it as a power bank?
- Insert a charged li-ion cell, connect your device with a USB Type-C cable, and use the discharge function. The LED indicator reports discharging and battery status while it runs. Keep a second charged cell for the flashlight so you are not left without light.
- What do the protection circuits actually cover?
- The charger includes protection against short circuits, over-current, over-voltage and reverse polarity. These circuits handle common electrical faults, but they are not a substitute for retiring a cell with damaged insulation or a dented can. Inspect the cell wrap and terminals before every charge.
- Does the LED tell me when the battery is full?
- The LED indicator shows charging, discharging and battery status, so you can monitor progress without a separate tester. Exact color or blink meanings are not specified in the catalog; rely on the status change from charging to ready.
Product facts
- Fenix ARE-X1 V2.0 Battery Charger: Single-channel smart charger built for 18650, 21700 and 26650 li-ion batteries. Match your flashlight's cell size to this list before buying; other sizes fall outside the stated support.
Fenix ARE-X1 V2.0 Battery Charger - Fenix ARE-X1 V2.0 Battery Charger: USB Type-C charging with discharging to keep other devices charged. One cable and one charged spare cell can serve both your light and a phone in a pinch.
- Fenix ARE-X1 V2.0 Battery Charger: LED indicator shows charging, discharging and battery status. You can tell whether a cell is ready or still working without a separate voltage tester.
- Fenix ARE-X1 V2.0 Battery Charger: Built-in protection circuits guard against short circuits, over-current, over-voltage and reverse polarity. These safeguards reduce the risk of common insertion and power mistakes, but they do not replace checking cell condition.
