Good Day prodal,
I have the Protected KeepPower 14500 840mAh (Cell & IC made in Japan) which use the Sanyo UR14500P, and also unprotected Sanyo UR14500P.
Subjectively, I can Not see any difference in brightness when using the Nitecore EA11.
The Protected KeepPower 14500 840mAh (Cell & IC made in Japan) have become my standard 14500 batteries, due to their quality & performance.
I bought them from Banggood:
KeepPower 14500 840mAh Protected U$7.99 Rechargeable li-ion Battery | Banggood
HKJ's Review:
Test/Review of Keeppower 14500 840mAh (Black) 2014 (VERY GOOD,Cell:Sanyo UR14500P,14.4x52.5mm) | BudgetLightForum (Mar14)
Best Regards.
George