Need some help

[alexfeetham]

So just got a sigelei 100w which im delighted with and I'm gonna be picking up some better tanks so I can crank this thing up past 20w. My question is really regarding the amp ratings on batteries and how the resistance of a coil affects this. My batteries are Nitecore 18650 IMR high drain rated for 30A and 2000 mah. How low a resistance on a coil is it safe to go with these and are these good batteries? I picked them up from a reliable vendor (myepack). I'm continuing to do research and will do before I even dare stick something under 0.5 ohms on this.

From what i've seen so far on the internet 30A batteries are good for up to 0.2 ohm coils. I'm also making sure that before I put this mod in my pocket or my bag or whatever that it is turned off, not charging batteries overnight even though my nitecore charger claims it will stop charging when the batteries are full.

So the question is how low/high volt/ohm/wattage wise is safe on these and are these good batteries. I do have a good/accurate multimeter available as well.

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[inswva]

I'm not familiar with the Nitecore batteries or if their stated amp limit rating is accurate. Any good 20A+ batteries such as the Samsung 25R, LG HE2, or Sony VTC series will be fine in the Sigelei 100. Start with a new pair (or better yet, two new pairs) - use them together, charge them together, and rotate their position in the mod with each battery change.

Spend the $24 and pick up four new Samsung 25R batteries from Lightning Vapes. Select the flat top 2-pack from the drop down list and apply discount code LV20 at checkout. They will end up being $6 each with free shipping.

Samsung INR 18650 25R Battery FLAT OR BUTTON TOP | Lightning Vapes

Coil resistance has no bearing on battery amp draw in a regulated, variable wattage mod (the Sigelei 100). Coil resistance only determines the output voltage. Your amp draw is determined by your wattage setting and the real time voltage of your batteries.

You can use Steam Engine's battery drain calculator to model the amp draw at various wattages and battery voltages. Select regulated device with power regulation (VW), enter 8.4V as your battery voltage to simulate a full charge for two cells in series, whatever wattage setting you desire, and 90% for APV efficiency (I don't actually know the Sig100s board efficiency but I assume around 90%). There are also battery presets you can apply if you wish to model usage time.

From there you can enter various values for coil resistance and watch how the output voltage changes but the amp draw (battery current drain) will remain static. Also, you can decrease the battery voltage and watch the amp draw increase. Note that to run the Sigelei 100 at maximum power you will need to build to .7ohm or less to stay within the devices voltage output limits.

Battery drain | Steam Engine | free vaping calculators

 

[Ryedan]

You can use Steam Engine's battery drain calculator to model the amp draw at various wattages and battery voltages. Select regulated device with power regulation (VW), enter 8.4V as your battery voltage to simulate a full charge for two cells in series, whatever wattage setting you desire, and 90% for APV efficiency (I don't actually know the Sig100s board efficiency but I assume around 90%). There are also battery presets you can apply if you wish to model usage time.

Great post inswva and I agree with it all except for the 8.4 battery voltage. The issue is that since the mod puts out 100 watts no matter what the actual battery voltage is, it draws higher amps from the batteries when they are at lower voltage. I use 6v for a two battery mod. 8.4v would be absolutely correct for a mechanical mod

 

[inswva]

Great post inswva and I agree with it all except for the 8.4 battery voltage. The issue is that since the mod puts out 100 watts no matter what the actual battery voltage is, it draws higher amps from the batteries when they are at lower voltage. I use 6v for a two battery mod. 8.4v would be absolutely correct for a mechanical mod

With two fully charged batteries at 4.2V each the input voltage to the board is 8.4V. Amp draw on a fresh charge will be ~13A at 100W. The Sig100 will start issuing low battery warnings at 6.4V. At 6.4V the battery current drain will be ~17A at 100W. I don't think this thing will even fire at 6V.

Any regulated variable wattage mod will pull more amps as battery voltage decreases, regardless of whether it is a 100W mod or a 30W mod. I'm not entirely sure I understand your post.

 

[edyle]

So just got a sigelei 100w which im delighted with and I'm gonna be picking up some better tanks so I can crank this thing up past 20w. My question is really regarding the amp ratings on batteries and how the resistance of a coil affects this. My batteries are Nitecore 18650 IMR high drain rated for 30A and 2000 mah. How low a resistance on a coil is it safe to go with these and are these good batteries? I picked them up from a reliable vendor (myepack). I'm continuing to do research and will do before I even dare stick something under 0.5 ohms on this.

From what i've seen so far on the internet 30A batteries are good for up to 0.2 ohm coils. I'm also making sure that before I put this mod in my pocket or my bag or whatever that it is turned off, not charging batteries overnight even though my nitecore charger claims it will stop charging when the batteries are full.

So the question is how low/high volt/ohm/wattage wise is safe on these and are these good batteries. I do have a good/accurate multimeter available as well.

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You sigelei 100watt uses 2 batteries in series.
To deliver 100 watts, it needs to get at least 50 watts from each battery.

watts = volts x amps
using 3 volts: 50 = 3 x amps
amps = 17 amps

 

[Ryedan]

With two fully charged batteries at 4.2V each the input voltage to the board is 8.4V. Amp draw on a fresh charge will be ~13A at 100W. The Sig100 will start issuing low battery warnings at 6.4V. At 6.4V the battery current drain will be ~17A at 100W. I don't think this thing will even fire at 6V.

Any regulated variable wattage mod will pull more amps as battery voltage decreases, regardless of whether it is a 100W mod or a 30W mod. I'm not entirely sure I understand your post.

Yup, sorry, I had a brain fart and didn't read your post correctly inswva. You got it right