welcome to the rebuildable world. i've found that you tubing multiple videos helps. try searching ECF for advice.
Just bought my first ever RBA! Help?
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Nice, that does help. That's a Samsung battery. To be specific, it's this one. It's a good battery, the dude wasn't jerkin' you around. The amp limit is 20A on this battery, which means you have a decent bit of headroom. In my opinion, a .46-.56 coil is pretty optimal for a RDA. .3 and lower fire really quick, which can sometimes be uncomfortable.
As the KidneyPuncher site says, you can build down to .22 before hitting the amp limit, BUT you shouldn't go lower than .3 just to maintain that headroom.
Also, wanna take a picture of your cotton? It looks, from what little I can see in that picture, that it is already burnt by the coils. This could mean you aren't juicing it up enough, or your coils are heating up too fast.
Before you put the cotton on, did you test fire your coils? They should glow red evenly, from the center to the outside (outward), and the "legs" (or the parts that get put in the posts) should NOT be glowing at all. Often times, when first attaching a new coil, it's necessary to "pulse" a little bit (press the button repeatedly, about 2 seconds at a time, letting them glow and then un-glow) to get it to fire correctly. In NO circumstance though, should your legs be heating up. If your coils aren't even, a quick fix is usually to tighten the posts, but it can also be an issue of your build (if it's strangely spaced out, or if coils overlap).
As the KidneyPuncher site says, you can build down to .22 before hitting the amp limit, BUT you shouldn't go lower than .3 just to maintain that headroom.
Also, wanna take a picture of your cotton? It looks, from what little I can see in that picture, that it is already burnt by the coils. This could mean you aren't juicing it up enough, or your coils are heating up too fast.
Before you put the cotton on, did you test fire your coils? They should glow red evenly, from the center to the outside (outward), and the "legs" (or the parts that get put in the posts) should NOT be glowing at all. Often times, when first attaching a new coil, it's necessary to "pulse" a little bit (press the button repeatedly, about 2 seconds at a time, letting them glow and then un-glow) to get it to fire correctly. In NO circumstance though, should your legs be heating up. If your coils aren't even, a quick fix is usually to tighten the posts, but it can also be an issue of your build (if it's strangely spaced out, or if coils overlap).
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ok thats a samsung 20a max batt, you are reasonably safe but not as safe as i like to be, I try not to exceed the max amps half way point. This is 10 amps in your case , If your burning up your wick lets get the ohms on the coil up. rebuild the coil or coils just like you did the first time but now lets double the wraps. So at 26 g kanthal your at 3 or 4 wraps now lets try 6 to 7 wraps. you need to be more familiar with ohms law, steamengine is great. but the rules are simple the higher the ohms (resistance) at a fixed voltage of 3.7 at the best the lower the amps and wattage. as you use your batt on a mech the volts will decrease the ohms remain the same but the amps get lower as well.
So .3 ohms is decent, but I should try to get them up just a bit more. So pretty much the lower the ohms, the more dangerous it is? If I try to bring it up to the .46ish mark, that'll make it more safe? I read an article about an RDA blowing up in a guys face and it kind of freaked me out a bit, so I just want to be really safe. From what I'm reading on other sites as well, sub ohms are significantly less safe than those that build around a 1 or 2 ohm coil?
If the amps and volts decrease as I'm using it, and the ohms stay the same, does that mean that if I get a .46 coil, it will be completely safe for all stages of battery life?
Also, I'm already using 6 wraps of 26g wire, should I make the coils larger in diameter? Or smaller? Or still use more wraps (like 7 or 8)?
I used a youtube video as guidance for my first build, and I did make sure that the coils were lighting from the inside out. But now that I think about it, I do think that the legs were glowing as well. I have noticed that my cotton did turn brown fairly quickly (after 4 or 5 hits), even though I'm positive that I'm saturating my wick enough.
If the amps and volts decrease as I'm using it, and the ohms stay the same, does that mean that if I get a .46 coil, it will be completely safe for all stages of battery life?
Also, I'm already using 6 wraps of 26g wire, should I make the coils larger in diameter? Or smaller? Or still use more wraps (like 7 or 8)?
I used a youtube video as guidance for my first build, and I did make sure that the coils were lighting from the inside out. But now that I think about it, I do think that the legs were glowing as well. I have noticed that my cotton did turn brown fairly quickly (after 4 or 5 hits), even though I'm positive that I'm saturating my wick enough.
Well first of all, damn that's a clean build for a first build.
Secondly, building a .4-.5 ohm coil is safer, while still technically sub-ohm. A 1-ohm or 2-ohm coil on a mech mod will likely take way too long to heat up for your liking, but that definitely depends on the amount of wire used.
Also. No mech is safe if the battery is unsafe. Once at 3.9v (or 3.7, but you're kinda stressin yer battery beyond that point), it's a good time to charge your battery. You'll learn to gauge how low your batteries are based on the amount of vapor it's producing/how quickly it's firing. Overall, I've found that a 2500mah 18650 with a .4 ohm coil will last (me, personally) about 2-3 hours. If I'm working (and only going out for breaks every so often), far longer. What kind of charger do you have? It should, in one way or another, show the voltage of your batteries.
But yeah, it looks like your wick might be a little charred, or that's just e-juice perfectly saturated in the middle? Either way, that is the driest wick I've ever seen lol.
Anyway, take your wick out (carefully as to not destroy the coils, something I've done before), and fire your device with no wick in it. Look for hot spots or hot legs.
Secondly, building a .4-.5 ohm coil is safer, while still technically sub-ohm. A 1-ohm or 2-ohm coil on a mech mod will likely take way too long to heat up for your liking, but that definitely depends on the amount of wire used.
Also. No mech is safe if the battery is unsafe. Once at 3.9v (or 3.7, but you're kinda stressin yer battery beyond that point), it's a good time to charge your battery. You'll learn to gauge how low your batteries are based on the amount of vapor it's producing/how quickly it's firing. Overall, I've found that a 2500mah 18650 with a .4 ohm coil will last (me, personally) about 2-3 hours. If I'm working (and only going out for breaks every so often), far longer. What kind of charger do you have? It should, in one way or another, show the voltage of your batteries.
But yeah, it looks like your wick might be a little charred, or that's just e-juice perfectly saturated in the middle? Either way, that is the driest wick I've ever seen lol.
Anyway, take your wick out (carefully as to not destroy the coils, something I've done before), and fire your device with no wick in it. Look for hot spots or hot legs.
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thats a pretty nice build, from the pic it does look like your not saturating the wick enough though.And yes .46 is less dangerous than .3 ,the amps and watts will only go down as you use the batt as the volts drop and your ohms remain the same the amps and watts go down. The thing about sub ohming is finding your sweet spot thats where the build and juice you use produces the cloud ,amount of flavor, heat, and throat hit you like. with the parallel build you have do a couple of more wraps this gets you in a safer zone and when you put the top cap on make sure the holes line up with coils this makes a big difference. I have a plum veil with a .7 ohm dual parallel this gives me alot of surface for flavor and one heck of a cloud, but I use a vv/vw device as well this is just more variables to deal with.
Oh yeah, suspect mentioned a VERY important thing. Make sure you're lining your coils up with your airholes!
The fact the you can build a 0.25 ohm coil, doesn't mean that you have to or should.
My advice is to start easy and only advance to the extremes when you gain enough experience and understanding and if you decide that this is what you want.
My advice is to start easy and only advance to the extremes when you gain enough experience and understanding and if you decide that this is what you want.
OP did not build a .25 ohm coil, and nobody here suggested he should.
You guys are honestly such a big help. Thanks! I apologize for all of my stupid questions, prior to this I've only ever used crappy vape pens like the ego-T so it was just extremely simple, fill the cartridge and go. hah.
So as the battery becomes less charged, it becomes more dangerous to use because it stresses the battery at lower Volts? I'm using a TrustFire charger, theres a switch on the side that switches between 4.2V and 3.0V. When the battery is plugged into the charger, theres a red light on it to indicate that it is charging, and it turns green when it's done charging and can be unplugged. As soon as I get home I'm going to try to build a new coil with higher ohms, hopefully making it a bit smoother and safer. Any specific tips you guys have I'll try! And I'll post pictures/details on how it goes.
So as the battery becomes less charged, it becomes more dangerous to use because it stresses the battery at lower Volts? I'm using a TrustFire charger, theres a switch on the side that switches between 4.2V and 3.0V. When the battery is plugged into the charger, theres a red light on it to indicate that it is charging, and it turns green when it's done charging and can be unplugged. As soon as I get home I'm going to try to build a new coil with higher ohms, hopefully making it a bit smoother and safer. Any specific tips you guys have I'll try! And I'll post pictures/details on how it goes.
Okay so I'm rebuilding my coils right now, I did 8 wraps of a 26g wire around a small screw driver. I plugged it into my omnitester and it read .4, so I heated the coils and was compressing them with tweezers and it was looking good when suddenly one of the coils just lit up really bright red and snapped off! Why did this happen!
Something worth mentioning- whenever you purchase a new atomizer, regardless of where you got it from, you should always disassemble it and give it a good cleaning before first use, to get rid of any leftover machine oil.The manufacturers don't always clean them thoroughly. Alcohol, or Dawn dishsoap should take care of it.
I rebuilt my coils, and I did 8 wraps of 26g. I made sure that the coils were heating up from the inside out, and the legs weren't glowing at all. (The first coil I did got really red hot randomly while I was squeezing it together with tweezers and snapped off. I'm not sure why.) I plugged it into my smok omnitester, and it read .4ohms (the down side of this meter is it doesn't go past 10ths decimal place). My battery when fully charged reads 4.2 watts. after about 20 minutes it read 4.1 (only hit about 5 or 6 times). How low can I let my battery get before it's actually dangerous?
Doesn't work this way. It's most dangerous when the battery is fully charged.
More volts at the same resistance means more amps, and not passing or reaching your battery's continuos amp rating is what you need to worry about.
Going too low (2.5V) will damage the battery, but has nothing to do with the resistance.
It won't explode or leak as a result, it just won't charge again.
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Lol.. Were you squeezing with tweezers while firing? If so, you just caused a short (assuming your tweezers are made from metal)! Very bad. Very very bad. Electricity 101: Don't touch metal stuff to something that's currently conducting electricity.
Also, I exaggerated a bit, 3.7 is probably the LOWEST you wanna let your batteries get, but that's a good amount of vaping.
Charging at 3.9 isn't harmful though, and some people suggest fully draining your batteries before charging them. But it's hard to tell when your battery is <3.7 vs. 3.7, plus at that point, you're not really getting a full-powered vape.
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