Ohm safety (battery explosions) new build

[nkucz]

I just bought a Little Boy RDA Clone paired with a Panzer Golden Army Mechanical Mod Clone. I was wondering if the Efest Purple IMR 35A 18650 2500mAh 3.7v batteries will be safe with a .35ohm coil build. If my calculations are correct 3.7v/.35ohm=10.57A and those batteries are rated for 35A? So all should be good right? No explosions? Also, I will be charging the batteries with a Nitecore i2! I'm new to mods and coil building and really, really, really don't want to blow up a battery safety is my main concern. What are your thoughts?

Edit: Also does it matter if my batteries are flat top or button top?

Thanks

 

[amtseung]

Oof.
Let's go in order of the things you listed.
1.) the purple efest is not 35A rated. It's actually a 25A continuous rated battery, and has a 35A pulse rating. The key to battery safety is the continuous amp rating.
2.) at 10.57ohms, you'll still be perfectly fine. Do beware that no two coils are identical, and no coil ever matches up to the ideal case.
3.) I have a nitecore i2 also. That thing is great. It charges to about 4.1v, then trickle charges continually to about 4.2, then stops, backs down to 4.1, rinse and repeat.
4.) flat top vs button top dictates how well it'll fit in your mod, not its performance.
5.) IMR's don't actually explode. LiPo's do. IMR's, when over-drained (roughly 10-30A over its continuous rating, I found) or over-charged (no numbers here), It'll fizzle, then catch on fire. You can search youtube for what it looks like. It's... anticlimactic at best. If you want to avoid explosions, look for a mod with good venting, which will avoid pressure build up so it doesn't go boom. Ideally, you'll never get there. I haven't, and I've been vaping between 0.1 and 0.14ohms every day for the past year.

As long as you have a decent ohm-meter that reads down to the hundredths, and remember ohm's law, you'll be fine.

Cheers!

 

[nkucz]

Oof.
Let's go in order of the things you listed.
1.) the purple efest is not 35A rated. It's actually a 25A continuous rated battery, and has a 35A pulse rating. The key to battery safety is the continuous amp rating.
2.) at 10.57ohms, you'll still be perfectly fine. Do beware that no two coils are identical, and no coil ever matches up to the ideal case.
3.) I have a nitecore i2 also. That thing is great. It charges to about 4.1v, then trickle charges continually to about 4.2, then stops, backs down to 4.1, rinse and repeat.
4.) flat top vs button top dictates how well it'll fit in your mod, not its performance.
5.) IMR's don't actually explode. LiPo's do. IMR's, when over-drained (roughly 10-30A over its continuous rating, I found) or over-charged (no numbers here), It'll fizzle, then catch on fire. You can search youtube for what it looks like. It's... anticlimactic at best. If you want to avoid explosions, look for a mod with good venting, which will avoid pressure build up so it doesn't go boom. Ideally, you'll never get there. I haven't, and I've been vaping between 0.1 and 0.14ohms every day for the past year.

As long as you have a decent ohm-meter that reads down to the hundredths, and remember ohm's law, you'll be fine.

Cheers!

Awesome thanks for your help! So potentially I could even drop the ohms down to 0.22 and still be safe on that battery because it has a continuous of 25A and using the law I would be drawing 16.8A? How close to the continuous amp is safe?

Thanks again

 

[Bunnykiller]

.2 is about the lowest I go on my builds.... Ive done a couple of .15's and didnt like the heat nor the fact the the mod got warmer than I cared for.....

 

[Rsunderl]

It's actually a 20A continuous battery.

Also, you want to leave a bit of safety margin (say 15% or so) when figuring out how low you can build your coils. That way, if the heat or juice or any other factor changes the ohms of your coil after it's first built (and that does happen), you have that margin of safety.

 

[AgentZen]

Cool post. I'm new here too but I've been playing around with mech mods for a few months and it is a great hobby. As long as you do it safe, you should be safe! I'm sure you've seen the steam-engine dot org calculator. You'll be building zipper coils in no time!

 

[sparkky1]

Awesome thanks for your help! So potentially I could even drop the ohms down to 0.22 and still be safe on that battery because it has a continuous of 25A and using the law I would be drawing 16.8A? How close to the continuous amp is safe?

Thanks again

15 - 20 % max

 

[CTVayper222]

Just for your information but you are doing your calculations wrong. Every battery is going to say 3.7 volts pretty much, but they will charge up to 4.2 volts on full capacity. You NEED to do your calculations with 4.2 as the voltage instead of using 3.7.... It's a minor change but when getting into sub-ohming it could very well become dangerous.

I use MXJO batteries that are 35 pulse and 25 continuos and I run a .23 in about 3 different RDA's.... It gives me the vapor production I want and still is on the cooler side of things. Try between .25-.4 and you won't be disappointed. Be safe and happy vaping!

 

[nkucz]

It's actually a 20A continuous battery.

Also, you want to leave a bit of safety margin (say 15% or so) when figuring out how low you can build your coils. That way, if the heat or juice or any other factor changes the ohms of your coil after it's first built (and that does happen), you have that margin of safety.

Do you guys have any battery recommendations that have higher continuous amps? My clone came with two coils and the reviews say they come between .22-.35ohms and I don't have an ohm reader so I want to be safe.

 

[Susan~S]

Do you guys have any battery recommendations that have higher continuous amps? My clone came with two coils and the reviews say they come between .22-.35ohms and I don't have an ohm reader so I want to be safe.

There is no way to be safe (even with a 30A battery) if you don't use an ohm reader or DMM to measure the build BEFORE putting it on your mod and firing it. There's no way to know if you have a short. Make sure you purchase one at the same time you get some new batteries.

Here are some options for a 30A battery:

1. Orbtronic SX30 2100mah 30A
2. Sony VTC4 2100mah 30A
3. Xtar 2100mah 30A (re-wrapped Sony VTC4)

Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.

* RTD Vapor => they usually have the Sony VTC4's in stock
* Illumination Supply
* Lighthound
* Orbtronics

 

[philoshop]

The problem with pulse ratings is that they're rarely well-defined as far as duration. Could be 10 seconds, maybe 5 seconds. If it's 2 seconds you won't even get a chance to just drop it before bad things happen very quickly.
I'm not the 'preachy' sort, and battery safety/technology has come a long way in the past decade, but saving a couple of dollars on a component that will probably last for several months doesn't strike me as wise. If you want to push the envelope buy the best batteries that are available.

 

[porkchopbun]

Do you guys have any battery recommendations that have higher continuous amps? My clone came with two coils and the reviews say they come between .22-.35ohms and I don't have an ohm reader so I want to be safe.

People are going to recommend the VCT series by Sony that are 30 amp continuous.
There are few Sony VCT4s out there left and the majority of the Sony VCT 5s are pretty much fake.

Here is RTD vapor's link for VCT4, they are pretty reliable vendor for batteries
Sony 18650 VTC4 2100mAh 30a

 

[nkucz]

There is no way to be safe (even with a 30A battery) if you don't use an ohm reader or DMM to measure the build BEFORE putting it on your mod and firing it. There's no way to know if you have a short. Make sure you purchase one at the same time you get some new batteries.

Here are some options for a 30A battery:

1. Orbtronic SX30 2100mah 30A
2. Sony VTC4 2100mah 30A
3. Xtar 2100mah 30A (re-wrapped Sony VTC4)

Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the

I'm gunna go with the Orbtronic SX30! So it would be safe to go all the way down to .18ohms because 4.2/1.8 is 23A and that's 20 percent less then 30A which the Orbtronic is rated for continuous. Do you know if I need a flat top or button top for the mod I purchased? Or does it not matter? Also, it says never drain below 2.5V.. How do you know when it's drained then?