Quick answer
XTAR 18650 4000mAh Protected Rechargeable Battery The XTAR 18650 4000mAh is a rechargeable, protected button-top lithium-ion battery for compatible thermal optics, flashlights, and other devices that require this specific 18650 format. It provides 3.6V nominal...
Who this is for
Best for
Buyers who want a purpose-built thermal setup matched to a real hunting, scanning, or surveillance use case.
Not ideal for
Buyers whose real use case is better served by a simpler or cheaper format.
Quick specifications
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- Battery
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Full product description
XTAR 18650 4000mAh Protected Rechargeable Battery
The XTAR 18650 4000mAh is a rechargeable, protected button-top lithium-ion battery for compatible thermal optics, flashlights, and other devices that require this specific 18650 format. It provides 3.6V nominal voltage, 4000mAh rated capacity, and up to 10A continuous discharge. XTAR rates it for more than 600 charge cycles.
Confirm fit before ordering: “18650” describes the battery format, but devices can differ in the terminal style, protection requirement, and battery-compartment clearance they accept. This protected button-top battery measures approximately 69.2 mm long. Check your device manual or contact Thermal Bros with your exact model.
Key specifications
- Battery format: 18650 rechargeable lithium-ion
- Nominal voltage: 3.6V
- Rated capacity: 4000mAh
- Maximum continuous discharge: 10A
- Positive terminal: Button top
- Protection circuit: Yes
- Manufacturer-rated cycle life: 600+ charge cycles
- Dimensions: 18.4 ± 0.3 mm diameter × 69.2 ± 0.5 mm length
- Weight: 50 g or less
Frequently asked questions
Is this the protected or unprotected XTAR 4000mAh battery?
This is the protected button-top version. XTAR also makes a separate unprotected, flat-top 4000mAh 18650 cell. Check which version your device requires before buying.
Will it work in my thermal scope?
It may work if your scope accepts a protected button-top 18650 with this battery’s dimensions and discharge rating. Battery format alone does not establish compatibility. Send Thermal Bros your scope model if you would like help checking.
Does 4000mAh guarantee a specific runtime?
No. Actual runtime depends on the device, its settings, operating temperature, and battery condition.
Charge this battery with a compatible lithium-ion charger. Carry spare cells in a protective case away from metal objects, and do not use a damaged battery.
Manuals & Setup
Where can I find instructions for XTAR 3.6V 18650 4000mAh Lithium battery?
A matching manual is not linked yet. Use the support resource below or ask Thermal Bros for help with your exact model.
Find this product in the manuals directory
Need help? Email info@thermalbros.com with your exact model and a description of the issue.