*** Note on King Kong batteries *** Description with ICR26650E on wrapping are typical Li-Ion chemistry: Lithium Cobalt - LiCoO2; Those with INR26650E are Lithium (NCM) Nickel Cobalt Manganese - Li(NiCoMn)O2. If you are using these in multi-cell flashlights, do not mix the two types of batteries.
Lots of good info on 26650 batteries here. I use the ICR King Kongs in my HD2010 and TF A8 and have been very happy with output and run time. Just don't mix and match chemistries in the same light.