Best 18650 battery for dual unregulated box mod?
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Google is your friend, this has been disputed hundreds if not thousands of times. Personally, I use the Samsung 25r, I've never had an issue with a quality manufactured battery. Just make sure the source is reliable and trustworthy. Just my two cents, I'll always pay a few bucks more and buy from a storefront.
that batteries have to be the same for a dual mod? and does it matter if its icr?
Yes, don't battery swap. You should be using the same type/brand to run your mod. However, switching types as long as it's in pairs, is more than fine, as long as you keep them separated. That's basic battery safety. As far as IMR VS. ICR, here's a helpful article regarding the subject.
Battery Basics for Mods: IMR or Protected ICR?
also i used a ohms law calculator but im confused.... I wanna run .3 ohms on a dual battery mod. so if each battery has 30 amps, or 3.7 volts... I double that for when i fill in the amps/votls section correct?
My personal rules for mechs, dual box mods
1) Unregulated Mech - Use 30amp CDR batteries (These include the LG HB6 and Sony VTC3 true 30amps, and the Sony VTC4 (20-25amp can be pushed to 30amps))
2) Paired battery configurations, buy the batteries together, date and label them their first charge date and as a set 1A, 1B, 2A, 2B, etc, use the batteries only with their paired mate, charge them with their paired mate, never break the married pair, till death do they part.
Check @Baditude and @Mooch blogs for some battery basics and test lists.
My own blog posts
Batteries, another Safety Guide | E-Cigarette Forum
Box Mods, What's the deal of these different configs? | E-Cigarette Forum
1) Unregulated Mech - Use 30amp CDR batteries (These include the LG HB6 and Sony VTC3 true 30amps, and the Sony VTC4 (20-25amp can be pushed to 30amps))
2) Paired battery configurations, buy the batteries together, date and label them their first charge date and as a set 1A, 1B, 2A, 2B, etc, use the batteries only with their paired mate, charge them with their paired mate, never break the married pair, till death do they part.
Check @Baditude and @Mooch blogs for some battery basics and test lists.
My own blog posts
Batteries, another Safety Guide | E-Cigarette Forum
Box Mods, What's the deal of these different configs? | E-Cigarette Forum
That depends if your mod is wired in series or parallel. Parallel mods are basically providing twice the battery life using only 3.7/4.2v although there are two batteries present, where as series mods use voltage from both batteries providing 7.4/8.4 v.
Parallel voltage remains the same of a single battery, CDR and mAh are doubled in that instance, so when rebuilding use 4.2v (fresh battery charge) and your coil resistance in your Ohm's Law calculator to get your Max Amp Output from a fresh charge, as the batteries drain the amps drop so fresh charge on a mech is the critical state.
okay i understood the first half can you please explain after when rebuilding use 4.2v.. please and thank you!
Not that I'm stating you're incorrect, but I've always used 3.7 as firing voltage and 4.2 as resting. Although the battery can hold 4.2V, the firing is 3.7/3.75V. Is that correct?
Ohm's Law, Amperage (I) = Voltage (V) divided by / Resistance (R or Ohms). 1 ohm coil at 4.2v fresh charge = 4.2amps (4.2v / 1 ohm = 4.2), 3.7v at 1 ohm = 3.7v see where the difference is on the same resistance, 0.5ohm coil at 4.2v = 8.4amps, 0.25 ohms at 4.2v = 16.8amps, so amp draw is at the most critical on a fresh charge.
still kind of confused sorry so will a .2 ohm work on 30 amp 1600 mah 2 batteries on dual parralel mod?
Yep, lower Ohms you go, the more amps you request from a battery. Also keep in mind, you really shouldn't build a coil so low it requests more than 50% of the Max CDR of your battery, as a battery ages and is used it decreases in mAh, stressing a battery (causing it to heat up) also damages mAh and C rating that relate to calculating max CDR of a battery, the mAh and/or C rating of a battery decrease, so does the max CDR, 6 months of hard stress usage on a battery could potentially only be for instance a Sony VTC4, 2100mah 20amp CDR, at that time could only be 1800mAh and 17amp CDR, 1 years, 1500mAh and 15amp CDR.
okay im gonna use 2 sony vtc 3 30 amp 1600 mah.. so as long as im .1 ohms and higher i should be good right? & also will the battery die fast?
also thanks for the help i appreciate it!
0.2ohms is 21amps, balanced equally in parallel that is 10.5amps per battery load, still for safety sake, the closer you get to 0.1ohm the closer you get to a natural dead short, so 0.2 is about the lowest, myself personally would build on a parallel dual battery mod, single battery 0.25ohm.
0.1ohms = 42amps, that would be 21amps per battery, still not advisable. Only time someone needs to be building between 0.05 to 0.15 is a Temperature controlled device using Ni200 wire, not on any other device, one loose connection on a mech that low, could drop the resistance down to 0.05, dead short the batteries, emergency room here you come.
okay thanks ill staye above .2.. Also one more question is the nitecore 18650 battery good to use.. i cant find how many amps it is
I believe it is an ICR not an IMR/INR, so I'd stay away from them. Check my blog links above, all will have links to good resellers to get good batteries that are authentic and from authorized reputable vendors here in the US.
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