New to forum. Ohm setting for mechanical mod?

[RamShot Rowdy]

The Tesla appears to be a VV/VW mod with a max output of about 18 watts. If the mod is about 85% efficient then it would need the battery to produce about 21.2 watts of power at maximum ouput. Peak current on a regulated mod will occur just before low voltage cutoff, around 3.2 volts hopefully. At 3.2 volts about 6.63 amps will be drawn from the battery to produce the 21.2 watts of power needed. So with a 6.8 amp CDR battery like the Panasonic, you have ZERO safety margin. Add to that the already stated concerns about the battery's chemistry and that makes this battery unsuitable for your application.

A 20 amp CDR battery from AW, LG, or Samsung would work great and leave plenty of amp headroom. See Baditude's blog for finding a good high drain safe chemistry battery.

 

[dazzed]

A 20 amp CDR battery from AW, LG, or Samsung would work great and leave plenty of amp headroom. See Baditude's blog for finding a good high drain safe chemistry battery.

I looked around and found this battery Samsung INR18650-25R. Found the spec for it.

Specs:

Flat top
Nominal capacity: 2500mah
Max Continuous Rated discharge 25amp (at 25 degree C)
Nominal voltage 3.6v
After a refresh charge 4.2v
Cycle info: Capacity drops to 60% after 250 full charge/discharge cycles
Don't discharge below: 2.5v
Standard charge: CC/CV @ 1 amp / 4.2 volts +/- .05v, 100mA cut-off
Max rapid discharge: CC/CV @ 4amps / 4.2 volts +/- .05v, 100mA cut-off
Imedance 22.15 +/- millohms

Would this work better than the panasonic?

 

[EdT586]

I looked around and found this battery Samsung INR18650-25R. Found the spec for it.

Specs:

Flat top
Nominal capacity: 2500mah
Max Continuous Rated discharge 25amp (at 25 degree C)
Nominal voltage 3.6v
After a refresh charge 4.2v
Cycle info: Capacity drops to 60% after 250 full charge/discharge cycles
Don't discharge below: 2.5v
Standard charge: CC/CV @ 1 amp / 4.2 volts +/- .05v, 100mA cut-off
Max rapid discharge: CC/CV @ 4amps / 4.2 volts +/- .05v, 100mA cut-off
Imedance 22.15 +/- millohms

Would this work better than the panasonic?

It depends on the battery's continuous amperage and chemistry. For a 6.8A battery don't go below 1.5ohns and you should be fine.
I don't know why people always think sub-ohming is required ?

That Samsung 25R is one of the best valued batteries for vaping now !

 

[EdT586]

Is there a chart somewhere in these forums for Ohms vs wire AWG size vs number of coils vs size of coil here somewhere ?

 

[ElConquistador]

Go to steam engine.org

 

[edyle]

Is there a chart somewhere in these forums for Ohms vs wire AWG size vs number of coils vs size of coil here somewhere ?

steam engine

Kanthal A1
gauge ----- watt per ohm (per coil) for 200mW/mm2
34 ----- 1.4
32 ----- 3
30 ----- 6
28 ----- 10
26 ----- 23
24 ----- 45
22 ----- 91
20 ----- 182

Coil wrapping | Steam Engine | free vaping calculators

Current might be a more intuitive way of thinking about it.

gauge ----- current (Amps) for 200mW/mm2
34 ----- 1.2
32 ----- 1.7
30 ----- 2.4
28 ----- 3
26 ----- 5
24 ----- 7
22 ----- 10
20 ----- 13