ARB-L18-3000P Battery: Which Fenix Lights Does It Fit?

The short answer: any Fenix light that takes an 18650

The ARB-L18-3000P is a 18650 Li-ion rechargeable battery, and Fenix states it works in all current models that use a li-ion 18650 battery, including many best sellers. So the compatibility question is really about your light's battery format, not about matching a specific model number.

If your Fenix flashlight or headlamp is designed for a standard 18650 cell, this battery is a candidate. If your light uses a different size or chemistry, it is not.

How to confirm your light takes this battery

Check the light's manual or product page for the required battery type. The ARB-L18-3000P is 18.7mm in diameter and 69.1mm long, so it fits lights with a standard 18650 compartment. It is a 3.6V Li-ion cell with a 3000mAh capacity.

Fenix states compatibility with all lights using an 18650 battery, but the supplied information does not list every model. If your manual specifies a different cell size, such as 21700 or 16340, this is not the right battery. If your light requires a button-top or protected cell, note that this battery includes a protection circuit in the anode.

ARB-L18-3000P at a glance

• ARB-L18-3000P Rechargeable Battery: Compatible with all lights using an 18650 battery. This is the core compatibility statement: if your Fenix light takes an 18650, this battery is designed to work.

  

• ARB-L18-3000P Rechargeable Battery: 3000mAh high capacity, 3.6V. Capacity affects runtime; voltage must match your light's requirement.
• ARB-L18-3000P Rechargeable Battery: Large current output up to 14A. High-drain lights need a cell that can deliver enough current; this one is rated for up to 14A.
• ARB-L18-3000P Rechargeable Battery: Includes a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. Built-in protection adds a layer of safety for rechargeable Li-ion use.
• ARB-L18-3000P Rechargeable Battery: 500 charge cycles. Gives you a sense of the battery's expected service life.

When the 14A output and protection circuit matter

The ARB-L18-3000P is built for high-current output up to 14A, which suits demanding lights that draw a lot of power. If you use a high-output flashlight regularly, this cell is designed to keep up.

The protection circuit helps guard against short circuits, overcharge, over-discharge and overheating. That makes it a sensible choice for everyday use, though it does not replace safe handling practices. The battery also has pressure vents to help prevent explosions.

Charging current is recommended at 1.5A, with a maximum of 3.9A. Use a charger that matches these ratings; the supplied information does not specify a particular charger model.

What the catalog does not tell you

The supplied information does not include a full model-by-model compatibility list, nor does it state whether this battery works with lights that require unprotected cells. It also does not specify charging time or exact runtime per mode. Use the manual for your specific light to confirm requirements.

If your light is not designed for 18650 cells, do not force this battery. Check the light's documentation first.

Key specifications

• ARB-L18-3000P Rechargeable Battery: Size: Length 2.72 in (69.1mm), Diameter 0.73 in (18.7mm). Confirms the standard 18650 form factor for fit.
• ARB-L18-3000P Rechargeable Battery: Weight: 1.69 ounces (48g). Relevant if you are counting grams for a lightweight setup.
• ARB-L18-3000P Rechargeable Battery: Warranty period: 12 months from date of purchase. Gives you a clear warranty window.