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Would aw imr battiers be good for sub ohm
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#1 (permalink)      11/24/2013 7:00:26 PM   quote/reply + tips
comced
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Would aw imr battiers be good for sub ohm
hey guys. I was just wondering if my aw imr 18650 batteries would be good enough for sub ohming? I know that the Maximum Continuous Discharge Rate is 10A, so i was wondering how low i can go with the resistance? I was planning on going .3-.5 ohms

Edited on 11/24/2013 at 7:10 PM. Reason:
#2 (permalink)      11/24/2013 7:15:10 PM   quote/reply + tips
zombie55
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+2 details
yes aw batteries are fine for sub ohm

voltage divide by resistance = amp draw

a fully charged battery is 4.2 volts so just take your ohm and divide it by 4.2

for instants

4.2 volts / 0.5 ohm coil = 8.4 amp draw

4.2 volts / 0.4 ohm coil = 10.5 amp draw

4.2 volts (fully charged battery) divide by 0.3 ohm coil = 14 amp draw your pushing the aw18650 hard to hard really I would not recommend going this low

aw 18650 batteries have a 18 amp peak rating but not continuous so you will be fine right the way down to 0.4 ohms as long as you don't continuous chain vape but you are pushing the battery hard maybe keep to 0.6 ohms I now mainly use the 30amp sony batteries(imr) that FT sell but the aw batteries will be fine and they are IMR safe chemistry which means they should not catch fire

if you find a battery is getting hot then back off a little but I have run my aw18650 at 0.4 ohms and they have been fine as the battery drops voltage the amp output changes

a half change battery at 3.7 volts if you do the calcutation again you are pulling less amps from the battery

3.7 volts (half charged battery) / 0.3 ohm coil =12.33 amp draw so you can see the amp draw has dropped by 2.2

The C-Rating of the battery defines the maximum draw (in amps) that the battery is capable of. To calculate the max amp draw you need the C-Rating and the mAh of the battery. For example a 2000 mAh battery rated at 10C would be:

Max Amp Draw = (mAh / 1000) * C-Rating

(2000 / 1000) * 10 = 20 Amp Max Draw

Note: Running your batteries at their C-Rating will decrease the overall life of the battery.

The C-Rating also indicates the amount of time the battery can support that discharge rate. A 1 C battery can support the calculated draw continuously for 1 hour. 2 C would be 1/2 of an hour. 10C would be 1/10 of an hour.

hope this helps

Edited on 11/25/2013 at 10:39 AM. Reason:
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#3 (permalink)      11/24/2013 7:25:23 PM   quote/reply + tips
comced
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You might of just made me a little more happier. I dont get it though because my aw imr battery has a maximum continuous discharge at 10A.
I watched this video http://www.youtube.com/watch?v=hWrosk_xjkY
and the guy said with a 10A battery you can only got down to .8 ohm max?
And what does continuous chain vape mean? Because i was planning on using a .4 ohm coil as my daily dripper to relax with.

If i do need a new battery, what do you suggest i get?
#4 (permalink)      11/24/2013 7:30:50 PM   quote/reply + tips
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Look up Ohms law calc..... It will do the math for you. You will also need a Multimeter (spend 30usd+) along with those batteries. .4ohm coil will pull over 10amps. Keep watching how to videos. Make sure you fully understand what you are doing before you do it. Basically a short or pushing the amp limit of your battery can ruin your day.

Also if you overheat your juice you will make Formaldehyde

Edited on 11/24/2013 at 7:33 PM. Reason:
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#5 (permalink)      11/24/2013 7:35:42 PM   quote/reply + tips
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I know i've been watching videos the past few weeks. The only problem is, is that i ordered the 18650 aw imr batteries, and i literally have a few hours before my order gets shipped out so i need to know what i should do!
#6 (permalink)      11/24/2013 7:42:32 PM   quote/reply + tips
alkrey
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if youre gonna get aw imr 18650's make sure you get the 1600mah. outperforms the 2000 and is better for low ohms.
#7 (permalink)      11/24/2013 7:53:23 PM   quote/reply + tips
zombie55
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the calculation I have been showing you is ohms law

Using Ohms law, Amps = Voltage/Resistance

Edited on 11/25/2013 at 10:37 AM. Reason:
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#8 (permalink)      11/24/2013 8:07:12 PM   quote/reply + tips
comced
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Oh i see! i get it now. Thanks so much
What batteries are good for below .4 ohms, just for my future reference.
oh and btw, i will be chain vaping

Edited on 11/24/2013 at 8:09 PM. Reason:
#9 (permalink)      11/24/2013 8:12:12 PM   quote/reply + tips
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sony 30A IMR, mnke 30A IMR, efest 30A IMR
#10 (permalink)      11/24/2013 8:37:45 PM   quote/reply + tips
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@coopz thank you!! The batteries you listed, would they be fine for chain vaping and going as low on the resistance as i want? Im talking like .2ohm max
#11 (permalink)      11/24/2013 8:57:52 PM   quote/reply + tips
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What does max continuing charge current mean
and max continuing discharge current mean?
http://www.batterysupports.com/sony-us18650vtc3-high-drain-30a-rechargeable-lithium-lion-18650-p-20.html

This 30a sony battery says it has a max continuing charge of 10a
but max continuing discharge of 30a