Nitecore WLB40 4000mAh Rechargeable USB-C Battery - Professional Work Light NWH20

The Nitecore WLB40 is a 4000mAh Li-ion NMC rechargeable battery specifically designed for Nitecore professional work headlamps, in particular the NWH20. Engineered to meet the demands of industrial environments, it powers professionals on factory floors, energy production facilities, industrial maintenance sites and technical inspection operations. Its integrated USB-C port eliminates the need for a separate charger: simply connect a standard USB-C cable to recharge on site. Reliable, durable and CE certified, the WLB40 is the dedicated power solution for professionals who cannot afford a power failure.

4000mAh High Capacity and Intelligent Indicator

With its 4000mAh capacity (14.4Wh), the WLB40 delivers stable, long-lasting power to cover an entire work shift. Its integrated battery level indicator provides instant status with a brief press of the indicator button, displaying the approximate remaining charge. Universal USB-C interface, no proprietary charger required, ensuring maximum convenience on any jobsite or industrial facility.

Professional Construction and Certified Reliability

The WLB40 stands out for its professional quality standards: its Li-ion NMC (Nickel Manganese Cobalt) chemistry ensures stable, sustained output for extended operations. Built-in protection circuits prevent overcharging, over-discharging and short circuits for safe use in industrial environments. Certified CE and RoHS, it meets European regulatory requirements. At 65g for 80.5mm × 24mm, compact and removable, the WLB40 swaps out in seconds without interrupting operations.

Operating Instructions

Battery Level Check: Short-press the indicator button to display the remaining charge level:

• 3 indicators steady = 67%-100%
• 2 indicators steady = 34%-66%
• 1 indicator steady = 11%-33%
• 1 indicator flashing = ≤10% (recharge immediately)

Charging: Connect a USB-C cable to the integrated port. The indicator flashes blue during charging, then remains steady blue once fully charged.

Battery Swap: Remove the WLB40 from the NWH20. Insert a replacement battery to resume operations immediately.

Specifications

• Professional rechargeable Li-ion NMC battery
• Capacity: 4000mAh 3.6V (14.4Wh)
• Chemistry: Li-ion NMC (Nickel Manganese Cobalt)
• Charging port: Integrated USB-C
• Battery level indicator: Yes (3 blue LED indicators)
• Protection: Overcharge / Over-discharge / Short circuit
• Certifications: CE, RoHS, WEEE
• Compatible: Nitecore NWH20 and compatible professional work headlamps
• Dimensions: 3.17" / 80.5mm±0.3mm (L) x 0.94" / 24mm±0.3mm (diameter)
• Weight: 2.29oz / 65g

Box Contents

• 1 WLB40 4000mAh Battery

⚠️ Safety Warnings

1. DO NOT use if the outer shell is damaged
2. DO NOT store or transport with metal objects
3. DO NOT discharge below 2.75V or charge above 4.2V
4. DO NOT disassemble, pierce, cut, crush, incinerate or short-circuit
5. DO NOT expose to fire or store above 50°C (122°F)