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Need help in recommendation of checking battery voltage for mechs


Chillaxman

Member For 2 Years
Member For 1 Year
I just use this one... it's old now, but it still works:

Thank you for the suggestion! Ill wait on other peoples suggestion on a more portable one, even the inline voltage meter I just found, that looks kinda bulky to carry around. If i have to, ill get a similar one :) Just clarifying, that one looks like it can only do 20A batteries or can it do 25A as well? At yhe moment im running Sony VTC5A which is a 25A.
 

CactusFanaticus

Silver Contributor
Member For 2 Years
The 20 amp rating on that meter is for the fuse in the amp meter, nothing to do with it checking voltage.
A coilmaster 521 tab (not the mini) would serve you well. Has a 510 plug that screws into the mod's 510 and can check voltage.
 

Carambrda

Gold Contributor
Member For 3 Years
ECF Refugee
Thank you for the suggestion! Ill wait on other peoples suggestion on a more portable one, even the inline voltage meter I just found, that looks kinda bulky to carry around. If i have to, ill get a similar one :) Just clarifying, that one looks like it can only do 20A batteries or can it do 25A as well? At yhe moment im running Sony VTC5A which is a 25A.
Using it to measure the volts, not amps. Amps on a mech mod can be calculated with Ohm's law... just subtract the voltage sag of the battery from the resting voltage of the battery. The voltage sag of the VTC5A is about .5 volts if you draw a current of 30 amps from the VTC5A (see Mooch's "Pulsed-Current Test Results": https://www.e-cigarette-forum.com/f...-test-results-a-fantastic-25a-battery.746719/ ). So if the battery is fully charged to 4.2 volts, at 30 amps you're getting a "running voltage" of 4.2 minus .5 equals 3.7 volts. So by using Ohm's law, we can now calculate that the resistance of the atomizer/coil build in this particular example should be about .12 ohms. (On a single VTC5A usually I vape at .1 -.11 ohms... so with my VTC5A fully charged I draw less than 36.5 amps, which IMO is about the sweet spot on a single VTC5A.)
 

Chillaxman

Member For 2 Years
Member For 1 Year
The 20 amp rating on that meter is for the fuse in the amp meter, nothing to do with it checking voltage.
A coilmaster 521 tab (not the mini) would serve you well. Has a 510 plug that screws into the mod's 510 and can check voltage.
Thank you for the suggestion! I was thinking of getting the 521 tab plus but are they the same for the voltage checker? Is there a signicant differenfe? If they'e the same, I'll go for the regular 521 tab
 

Chillaxman

Member For 2 Years
Member For 1 Year
Using it to
Using it to measure the volts, not amps. Amps on a mech mod can be calculated with Ohm's law... just subtract the voltage sag of the battery from the resting voltage of the battery. The voltage sag of the VTC5A is about .5 volts if you draw a current of 30 amps from the VTC5A (see Mooch's "Pulsed-Current Test Results": https://www.e-cigarette-forum.com/f...-test-results-a-fantastic-25a-battery.746719/ ). So if the battery is fully charged to 4.2 volts, at 30 amps you're getting a "running voltage" of 4.2 minus .5 equals 3.7 volts. So by using Ohm's law, we can now calculate that the resistance of the atomizer/coil build in this particular example should be about .12 ohms. (On a single VTC5A usually I vape at .1 -.11 ohms... so with my VTC5A fully charged I draw less than 36.5 amps, which IMO is about the sweet spot on a single VTC5A.)
Those info are very helpful, thank you!
 

CactusFanaticus

Silver Contributor
Member For 2 Years
Thank you for the suggestion! I was thinking of getting the 521 tab plus but are they the same for the voltage checker? Is there a signicant differenfe? If they'e the same, I'll go for the regular 521 tab
Not sure about the plus, I have the the regular and it's a good product, use it almost daily building coils/re wicking.
 

merememories

Member For 2 Years
Member For 1 Year
I need one to check the voltage of the battery so I would have an accurate idea when to take out the battery.
I change my batteries once I feel a weakness in the vape. But if your really want to use a device you don't need a four digit accuracy, just use the coils master reader. If you don't have one, buy it. It is cheap it is accurate up to +-0.05 so just round it to the nearest tenth. This is good enough I think
 

Carambrda

Gold Contributor
Member For 3 Years
ECF Refugee
I need one to check the voltage of the battery so I would have an accurate idea when to take out the battery.
I take out the battery the moment I no longer get enough "oomph". With a .1 ohm build this happens typically not too far below 3.8 volts so, after a little while, your brain starts to become a fairly accurate volts checker... like happened to this guy:

 
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