26650 MNKE 20 Pulse discharge current question

[betterthanyou]

MNKE 3500maH falt top

Maximum Continuous Discharging Current: 20 A
Maximum Pulse Discharging Current: 60 A

I ordered a bunch fo the MNKEs 26650s (the sonys are impossible to find)),

What is pulse discharging current? How do i know when I am vaping on the pulse discharge current and not the maxximum continuous discharge of 20A?

Thanks

 

[K_Tech]

You'll know by reading the resistance of your coil and doing the math.

I apologize if I am telling you something you already know, amp = volts/resistance.

Using 4.2 volts (assuming a fully charged battery is the safe way to calculate current):

1 ohm coil: 4.2/1 = 4.2 amps
.5 ohm coil: 4.2/0.5 = 8.4 amps
.2 ohm coil: 4.2/0.2 = 21 amps
.1 ohm coil: 4.2/0.1 = 42 amps

And so on.

I cannot find an "official" number for how long of a pulse that battery is rated for, although I've seen vendors list the pulse time from 3 to 10 seconds.

 

[steved5600]

On a fresh battery .21 ohms will be the lowest you can go. Here is a tool for you. Ohm's law | Steam Engine | free vaping calculators

 

[betterthanyou]

On a fresh battery .21 ohms will be the lowest you can go. Here is a tool for you. Ohm's law | Steam Engine | free vaping calculators

I understand what you are trying to say, but you are incorrect by thinking I can only run 20amps through my device. I can safely go much higher, 60A pulse. I could safely run 50 amps.

 

[Baditude]

I understand what you are trying to say, but you are incorrect by thinking I can only run 20amps through my device. I can safely go much higher, 60A pulse. I could safely run 50 amps.

You are misunderstanding the entire concept.

It's not so much how much current your device can handle, its how much current that can be drawn safely from the battery which is being discussed here.

Batteries have limits to how many amps that can be pulled from them SAFELY. This is rated by both the maximum continuous discharge rate and the maximum pulse discharge rate ​of the battery. These battery specifications are provided by the manufacturer on their product description sheet (sometimes). Most sub-ohm vapers use the continuous rating in their calculations.

You measure your coil resistance and then plug the numbers of resistance and voltage (always 4.2 volts) into a calculator as posted above. The current (answer to the calculation) is the amps that will be drawn from the battery by that particular coil. The amps (current) must not exceed the battery's maximum continuous discharge rate spec or your battery may go "BOOM".

1.0 ohm = 4.2 amp draw
0.9 ohm = 4.6 amp draw
0.8 ohm = 5.2 amp draw
0.7 ohms = 6 amp draw
0.6 ohms = 7 amp draw
0.5 ohms = 8.4 amp draw
0.4 ohms = 10.5 amp draw
0.3 ohms = 14.0 amp draw
0.2 ohms = 21.0 amp draw
0.1 ohms = 42.0 amp draw
lower ohms than 0.1 ohms is essentially a dead short

 

[skoony]

maximum continuous discharge rates and pulse rates are given more for a circuit designers point of view.they are not intended to mean this is what you can or should run your device at.when designing a circuit you might need a lot of current to fully charge the circuit initially. this is usually do to capacitance in the circuit. a properly designed circuit once charged will then draw the current needed to perform its intended function.remember the whole idea of using a battery is to get some useful work out of the circuit before having to recharge or replace the battery. phones,laptops,cameras,etc.. .how ever much like how they are used in radio controlled cars and planes you can safely push the limits to an extent. the mah rating is the current draw recommended by the manufacturer to get the most useful life out of the battery. go to extremes either way and battery life is degraded,especially when at or near the maximum continuous current draw. read everything you can find concerning sub ohming and batteries and safety in their use.

regards
mike