Test/Review of Xtar 26650 4000mAh (Black)

Xtar 26650 4000mAh (Black)

Official specifications:

  • 4000mAh high capacity
  • Specially designed for high-performance flashlights and electronic cigarette
  • Short-circuit protection, ensure safety
  • Improved voltage stability due to low internal resistance
  • Innovative structure design, ensures impact-resistant, effectively protects the battery economical and eco-friendly
  • Voltage: 3.7V
  • Battery Capacity: 4000mAh
  • Size(mm): 26.1±0.2mm(body diameter)x 67.5±0.5mm (length)
  • Rechargeable

This battery does easily mathc the specified capacity, even at higher loads.

The two batteries does have a fairly good match and good capacity.


This battery is a good 26650 battery, it can easily handle a 7A load and will also work at 10A load.

Notes and links

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries

Thanks HKJ!

Thanks HKJ for another useful review, I am just getting into 26650 battery lights and this sounds like a good battery.