UltraFire 16340 650mAh (Red-black)

Official specifications:
  • Battery Capacity (Mfg Rated): 650 mAh
  • Battery Chemistry: Li-Ion
  • Battery Feature: Rechargeable
  • Battery Form Factor: BRC 16340
  • Battery Rated Voltage: 3.7 V

This is a fairly new style packing from UltraFire, but is the contents any good?

One of the cell has the rated capacity, the other have less capacity and neither of them can deliver more than 1A to 2A. This do not look like a high current cell.


This battery is not a high current battery and the mismatch between the two cells is rather high.
It looks like it has a working overload protection, but at a way to high value.

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
Comparison to other LiIon batteries