Which Battery is best?

[iGl0]

I am 'sub-ohming' with a CGR18650CH. I use less than 5 mL of liquid, and battery is already low. Looking to buy something that can sustain better and safer for sub-ohm builds.

 

[iGl0]

Thinking about getting the IMR MNKE's or the Orbtronic Li-ion.

 

[Baditude]

It must be a high drain IMR or IMR/Hybrid battery of 20 amps or more. Those Panny's only have a 10 amp limit. How low have you been making your coils?

AW IMR
18650 1600mah 24Amp CDR

MNKE IMR
18650 1500mah ​20A

Orbtronic hybrid
Orbtronic 18650 SX22 (hybrid) 2000mAh 22A

Samsung hybrid (LiNiCoMnP)
INR18650-20R 2000mah 22A

Sony
us18650vct3 (hybrid) 1600mAh 30A

Efest IMR
18650 1600mAh 30A

*Amp rating is in continuous discharge rate​

 

[iGl0]

Seems like the higher amps would be best? Thinking either efest or sony now, they all seem roughly the same price.

 

[tj99959]

Now you know why I don't bother with sub ohm. High wattage just = short battery life. I can get a better vape out of a ~2 ohm coil anyway, you just have to know how to wrap it.

 

[DKP#]

The CGR18650CH is rated 2250mAh 10A
It's limited to 10 Amps discharge rate. A good rule of thumb is to allow a 50% safety factor for pv's, so for design purposes, figure 5 Amps max.
A fully charged battery is 4.2Volts
R = V/I = 4.2volts/5amps = 0.84 ohms minimum
as long as you're 0.8 ohms or above, a 10A battery is fine

The time it lasts has to do with the mAh rating.
2250 mAh = 2.25 Ah. this means that drawing 2.25 Amps will drain the battery in 1 hour

An NCR18650PD 2900mAh 10A might be your best bet as long as you're running 0.8 ohms or above. Still not going to get much more duration out of a charge.

I've never had a mech or rba but been thinking about it. I think this Is correct, but I'm not certain

 

[Baditude]

The CGR18650CH is rated 2250mAh 10A
It's limited to 10 Amps discharge rate. A good rule of thumb is to allow a 20% safety factor, so for design purposes, figure 8 Amps max.
A fully charged battery is 4.2Volts
R = V/I = 4.2volts/8amps = 0.53 ohms minimum
as long as you're 0.5 ohms or above, a 10A battery is finee

The time it lasts has to do with the mAh rating.
2250 mAh = 2.25 Ah. this means that drawing 2.25 Amps will drain the battery in 1 hour

An NCR18650PD 2900mAh 10A might be your best bet as long as you're running 0.5 ohms or above. Still not going to get much more duration out of a charge.

I've never had a mech or rba but been thinking about it. I think this Is correct, but I'm not certain

Although your Ohm's Law is intact, pratical experience with an RBA has taught me that you can throw mAh ratings out the window when using a high drain delivery device like an RBA. I use AW IMR 18650 2000 mAh batteries with the same 10 amp rating. I never have done sub ohm, but using a 2.0 ohm coil on my RBA's I can expect to get 1/2 the said battery life in mAh. I would expect sub ohm would be even less battery life.

And from experience, seeing how coil resistance can inexplicably change for no apparant reason, I always recommend PLENTY of safe wiggle room in the resistance/amp ratio. For a 10 amp limit battery, I recommend only making > 0.8 ohm coils.

 

[DKP#]

And from experience, seeing how coil resistance can inexplicably change for no apparant reason, I always recommend PLENTY of safe wiggle room in the resistance/amp ratio. For a 10 amp limit battery, I recommend only making > 0.8 ohm coils.

I'll keep that in mind. A 50% safety factor for something that could explode in your face does sound reasonable.

 

[iGl0]

Although your Ohm's Law is intact, pratical experience with an RBA has taught me that you can throw mAh ratings out the window when using a high drain delivery device like an RBA. I use AW IMR 18650 2000 mAh batteries with the same 10 amp rating. I never have done sub ohm, but using a 2.0 ohm coil on my RBA's I can expect to get 1/2 the said battery life in mAh. I would expect sub ohm would be even less battery life.

And from experience, seeing how coil resistance can inexplicably change for no apparant reason, I always recommend PLENTY of safe wiggle room in the resistance/amp ratio. For a 10 amp limit battery, I recommend only making > 0.8 ohm coils.

Thanks for all the helpful information. Only wanted to try sub-ohms just to see what all the talk was about myself. Guess what I really want to know is:

Why is it forming more vapor covering less area with a fatter wire better than covering more area with a fatter wire? Almost makes no sense at all to sub-ohm. Draining battery at a faster rate as well.

Say a 28g ribbon of kanthal A1 at .3 ohms in comparison to the same 28g ribbon at 1.5 ohms...

 

[DKP#]

5x more current with the .3 ohms (um, that's 14 amps with a fresh battery)

Lower resistance means more current which means more power. (at the same voltage)

Power = (Voltage * Voltage) / Resistance

(3.7V * 3.7V)/.3 ohms = 45.6 watts
(3.7V * 3.7V)/1.5 ohms = 9.1 watts

 

[minoh]

good post! i like it!