safe sub-ohm for AW or SONY VTC4 battery?

[Scorpios]

I built a twisted kanthal dual mico coil and it's reading at 0.4 ohms, which is the lowest I have gone.

I have an AW IMR 18650 (3.7V 2000mAh (7.4 WH),
and a Sony VTC4

Safe to use this build with these batteries and is there more risk on a battery that is getting low on it's charge?

Thanks.

 

[Steam Turbine]

Your build is not suitable for your AW but it is for your VTC4.

Your coil have the potential of pumping out 10.5 amps out of your battery.


AW 18650 2000 mAh have a 10 Amp limit. So this is a no go.

VTC4 have a 30 Amp limit... So you have a lot of head room here.

vape away safely.



Do not over-discharge your VTC4 under 2.5 volt.... I never discharge them under 3.2 volts personally.

 

[Scorpios]

Thank you sir. this was my first build like this and it turned out good for a change.

 

[Krieger]

The rule of thumb I always go by is never go over 80% of the amperage rating of your battery.

 

[Baditude]

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
0.0 ohms = dead short ---> BOOM!

AW 18650 IMR 2000mah battery = 10 Amp continuous discharge rate
AW 18650 IMR 1600mah battery = 24 A
Sony US18650VTC3 1600mAh = 30 A
Sony US18650VTC4 2100mAh = 30 A
Sony US18650VTC5 2600mAh = 30 A

Battery Basics for Mods

 

[Ryedan]

Safe to use this build with these batteries and is there more risk on a battery that is getting low on it's charge?

You already got great responses to the first part of your post. Just wanted to address the bold above.

Here is a online Ohm's law calculator. Plug in the battery voltage and the coil resistance, click calculate and it will fill in the rest. Your battery needs to stay under its maximum current (amp) draw.

Your battery will be pretty close to 4.2 volts fresh off the charger and as you use it the voltage will go down. Leave 0.4 ohms in the calculator and decrease the volts and you'll see the amps and watts go down. The most critical time for a battery is when it is fully charged.

Batteries go from 4.2 volts quickly to around 3.8 volts. They then take a lot longer to go from 3.8V to say 3.6V. After that they go down faster and faster. I change my mech mod batteries at between 3.8 - 3.6V. If you run one down to less than 2.5V you will cause it damage and shorten its life. They go from 3.3 to 2.5 volts really quickly!

 

[Scorpios]

Thanks for the replies, very helpful.

 

[Unforeseen]

Moved to Assorted APV Discussions - Rebuildable Atomizer Systems