Which batteries are the safest?

[thewomenfolk]

I have a new Poldiac and a ROBH rda I'm using with it. I'm using it in the 18500 mode for now. I don't want to go under about .6 ohms so I'm wondering which batteries I should buy to keep things safe. Can someone tell me how many Amps there need to be in a battery to be safe? And what are the different Amps for the AW IMR's vs the eFest and Sony batteries? Of course I'd like to get a bang for my buck but safety must rule because I need my face. (I guess maybe I don't really want a 'bang' for my buck.) lol

I guess the Amps are different in the 18350, 18500, and 18650 batts...is there a sticky around here some place that gives those Amp numbers?

Also, I'd like to think if I build a .7 Ohm coil, it'll stay there, but what is reasonable to expect for the Ohms to go lower as the atty is used. And are there some tips that'll help this not happen?

 

[wonner]

Here is a calculator which should answer most of your questions:

Steam Engine

As for brands, I like Orbtronic SX30.

But also Sony, LG, Samsung, among others.

 

[nyiddle]

I guess the Amps are different in the 18350, 18500, and 18650 batts...is there a sticky around here some place that gives those Amp numbers?

The "18350" etc. just dictates the size of the battery (ie: 18mm in diameter, etc.) Each manufacturer will have a different amp rating per battery. In general, 20A seems to be the highest most companies go. 35A batteries are advertised, but are often found to be rewraps.

I like to leave "headroom". Using the Steam Engine calculator, you can figure out how many amps (depending on your battery, and what ohms your coil is at) you're drawing, and subsequently, how much "headroom" you have. I'd say always try and leave 7A (or more) headroom. As battery voltage decreases, amps usage will increase.

Also, I'd like to think if I build a .7 Ohm coil, it'll stay there, but what is reasonable to expect for the Ohms to go lower as the atty is used. And are there some tips that'll help this not happen?

Wha? Coil resistance should not drop. Period.

 

[thewomenfolk]

Once I know how many Amps my batteries have, then I can use the chart, so thanks for that, wonner. But I need to know how many Amps are in a 350, 500, and 650 battery, unless those change with different manufacturers. And what is headroom, leaving 7 amps above what should be safe? Sorry I'm slow.

 

[inswva]

The "18350" etc. just dictates the size of the battery (ie: 18mm in diameter, etc.) Each manufacturer will have a different amp rating per battery. In general, 20A seems to be the highest most companies go. 35A batteries are advertised, but are often found to be rewraps.

I like to leave "headroom". Using the Steam Engine calculator, you can figure out how many amps (depending on your battery, and what ohms your coil is at) you're drawing, and subsequently, how much "headroom" you have. I'd say always try and leave 7A (or more) headroom. As battery voltage decreases, amps usage will increase.



Wha? Coil resistance should not drop. Period.

Huh? Amp draw decreases as the battery voltage decreases.

 

[inswva]

OP, this is a good place to start on your battery learnin'

http://www.e-cigarette-forum.com/fo...chargers-multi-meters-forum.html#post12698746

 

[inswva]

double post

 

[wonner]

Once I know how many Amps my batteries have, then I can use the chart, so thanks for that, wonner. But I need to know how many Amps are in a 350, 500, and 650 battery, unless those change with different manufacturers. And what is headroom, leaving 7 amps above what should be safe? Sorry I'm slow.

The figure you are looking for is "Continuous Discharge" and it does change with every manufacturer and every different battery that company makes.

If the specs for a battery do not list Continuous Discharge and only list Max Discharge or Pulse, walk away.

 

[nyiddle]

Huh? Amp draw decreases as the battery voltage decreases.

Other way around. Fack.

That's literally the fourth or fifth time I've mixed that up in the last 2 weeks. That and batteries in series vs. batteries in parallel. Dunno what my deal is.

Once I know how many Amps my batteries have, then I can use the chart, so thanks for that, wonner. But I need to know how many Amps are in a 350, 500, and 650 battery, unless those change with different manufacturers. And what is headroom, leaving 7 amps above what should be safe? Sorry I'm slow.

Again OP, amps in a battery depends entirely on the manufacturer/specific battery type. There are 18650's (designed for power tool battery packs) that have CRAZY high amp drain limits. They wouldn't be suitable for vapes, because they don't output a lot of voltage, and they have lower mAh (as they are meant to be part of a battery pack, chained together in series).

 

[thewomenfolk]

OP, this is a good place to start on your battery learnin'

http://www.e-cigarette-forum.com/fo...chargers-multi-meters-forum.html#post12698746

Okay, you guys are going to force me to go learn! i was really trying to avoid that kind of work.

As for coils decreasing in Ohms...I was using one at .4 Ohm last night and when I used it this morning it had gone down to 3.1 Ohms. I was just wondering what could have caused it to do that. I tore it off and rebuilt.

Thanks to all of you for your help. I appreciate your efforts! I will go now and do my homework.