The Nitecore WLB40 is a 4,000mAh rechargeable lithium-ion battery that comes with a USB-C charging port and is a dedicated power source for Nitecore's Worklights and is compatible with models including the NWH20 headlamp.

Key Features:

• Capacity & Charging: Built around a 4,000mAh Li-ion cell, the WLB40 offers substantial capacity for extended use between charges. It charges via a USB-C port, allowing convenient, reversible charging with widely available cables and power sources.
• Performance Output: When paired with a compatible headlamp, the WLB40 supports a maximum output of 600 lumens, with runtime scaling depending on the brightness level selected. At turbo output the light runs for roughly 5.5 hours, while on the lowest "ultralow" setting it can sustain output for around 51 hours, giving users flexibility to balance brightness against battery life.
• Reliability & Safety: As with Nitecore's broader battery lineup, the WLB40 is engineered with intelligent charging circuitry to help protect against overcharging, over-discharging, and short circuits, contributing to a longer usable lifespan and safer day-to-day operation.
• Durability: The battery is built to work within housings that carry an IP66 dustproof and waterproof rating and are impact resistant to 2 meters, making it well-suited to demanding outdoor, industrial, or job-site environments.

Because of its high capacity and rugged compatibility, the WLB40 is well suited for professionals in construction, mining, search and rescue, and other fields requiring long-lasting, dependable headlamp power throughout extended shifts.

Designed with a battery level indicator, when short pressing the indicator button the corresponding indicators will light up to indicate the remaining charge.

3 Constant – on: 67%-100%

2 Constant -on: 34%-66%

1 Constant -on: 11%-33%

1 Flashing: ≤ 10% (Low battery. Please recharge the battery as soon as possible.)  

Please note: We are unable to accept returned batteries once they have been opened, so please ensure they are the correct cell for your device before ordering.

Please note all orders for individual batteries without a device are sent via Royal Mail 48 Tracked, and not Royal Mail 24 Tracked or Special Delivery. Due to shipping restrictions, we are unable to send individual batteries to the Outer Hebrides, Scottish Highlands and surrounding areas, Channel Islands and Northern Ireland. Please see our delivery page for further details.