June 22, 2017, 5:15pm
UltraFire BRC26650 7800mAh (Red)
Type: Rechargeable Li-lithium battery
Max Continuous Discharge: 8A
Max Peak Discharge: 4A Something is wrong with Peak/Continuous rating
Size: about 66*25*25mm
Cheap super high capacity 26650, it is barely necessary to test to give a correct conclusion.
The two cells I tested have different capacity, the best can reach 2300mAh at 0.2A. They can barely deliver 7A.
Even at maximum load the temperature is not that bad.
Different capacity for the two cells, below 1/3 the rated capacity, problems delivering rated current, it is bad cells.
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
Compare to 18650 and other batteries
Compare to 26650 and other batteries
Batteries with ridiculous ratings
June 22, 2017, 5:45pm
Ultrafire is a joke. Uninformed consumers are the butt of those jokes.
June 22, 2017, 5:46pm
“You can fool all of the people some of the time and some of the people all of the time,
but you cannot fool all of the people all of the time.”
Seems that the XXX-Fire companies are focussed on doing the first.
There is always a fresh group of customers that thinks those wrappers tell the truth.
HKJ thanks for proving your idea was right, though is does not always make you happy.
June 22, 2017, 6:12pm
I am always happy to show the world my findings.
Yay, they started making explosives in bigger sizes!
June 23, 2017, 8:40am
On the other hand, just noticed the battery is claimed as “protected” on the wrapper.
Random low cost cell + random flashy wrapper = finished product.
June 23, 2017, 8:49am
That is the standard wrapper for ultrafire cells (Protected or not). I do address it in the article linked at the bottom.
There is also the detail that it is the (non existing) PCB that will last 10 years, not the battery.
June 28, 2017, 12:43pm
This must be premium batch, mine topped at 600mAh.