The LED flashlights I encounter require between 5A to 8A of discharge current.
I would prefer to use “protected” cell for safety consideration.
My questions are:
a) Is the above LiitoKala Lii-50E IMR 21700 suitable for LED flashlight use, given its Continuous Discharging Current of 3C and Max Current Discharge of 5C ?
b) I notice from their website pictures that the battery has “black ribbons” attached to its +/- ends. What are those “black ribbons” for ?
I would NOT consider buying these for use in your flashlight.
And this is NOT because the battery can’t deliver the power you need.
Continuous Discharge
(mAh / 1000) x C Rate = Continuous Discharge Amperage
So 5 x C Rate 3 = 15A Continuous Discharge Amperage => good enough
But: this is NOT a protected battery, those are hardly ever (AKA never) flat top.
Plus: the ribbons you see are nickle tags, spotwelded to top and bottom of the battery.
That make these impossible, and even dangerous, to use inside a flashlight.
They are meant for applications like DIY battery packs in electric bicycles etc.
Which brand(s) & model(s) of battery should I consider ?
2. I somehow notice that many of the 21700 batteries with measurement of 21mm X 70mm are “unprotected”, while the “protected” ones tend to be longer by some 3 to 5mm and wider than 21mm by a bit.
