High drain batteries - how do they specify or test them?
Flashlights don’t usually get into the 20 amps out of a single cell category, usually it;s the vapers that use that.
(Which is also why they tend to explode…)
They talk about “sub-ohm” heating elements…
But my question is, are these cells protected?
Some of them are rated 20 and 30 amps from an 18650
How do they rate that?
Is it
A. “battery only permits so much because of internal resistance or protection circuitry”?
B. “it will do this high amp draw at this min voltage…”?
I’m sure there is also specsmanship and different ways to rate, and just outright lying too.
But still, if you needed to sell these batteries, how would you specify that?
I’ll go out on a really short, strong and stable limb and speculate that there is no minimum standardization what so ever from the OEM cell manufacturers. Its very likely the more reputable OEMs (panasonic, sanyo, samsung, LG, sony…etc) do have testing requirements but its anyones guess how standardized those are from one to the other.
By the time the product reaches the person heat shrinking their name on the outside there’s absolutely no standardized testing at that level.
Yeah, sub-Ohm vapers…
Come to think of it, i think my S41S on Sony VTC5 may well draw some 10 Amperes on a fully charged cell…
That’s 10 Amperes at approximately 3.8 Volts (maybe more, i don’t know how much they sag).
R (resistance) = U (voltage) : I (current), so that would be 3.8 : 10 = 0.38 Ohm….
Sub-Ohm flashlight…