rda coil resistance?

[zhentipede]

what is the lowest resistance in ohms can i go without using a kick1 kick2 or fuse when using AW 18490/Efest 18500

batteries? currently i been using 0.7 - 1.2 ohms in the mech mod... will my batteries handle this resistance without worry of battery over draw in amperes?


thanks for any feedback

 

[Baditude]

You must know the "continuous discharge rate" of the battery in amps to know if it is a fit for the resistance you want to use. Use the Ohm's Law calculator, adding in the coil resistance and the voltage to complete the calculation. The current will be the amps pulled from the battery.

The AW 18490 IMR has a 8.8 amp CDR. I don't have the specifications of the Efest in this size, and would not just assume it is the same as the AW as this specification can vary from model to model from manufacturer to manufacturer. Is the 18500 Efest an IMR or protected Li Ion? You should only use an IMR for an RBA/RDA.


0.7 ohm @ 4.2 volts will pull 6 amps from the AW 18490. They should be able to handle this resistance and still have some safe head room available.

0.5 ohm @ 4.2 volts will pull 8.4 amps from the AW 18490, which is nearly its projected CDR in amps. This would really be pushing these batteries. You want some safe head room when pushing a battery this hard. Using them this way will greatly decrease their capacity and will greatly shorten their expected lifespan. You'll be disappointed in the performance and you have a greater risk of severe battery failure.

Ohm's Law Calculator

AW IMR
18650 2000mah 10Amp CDR
18650 1600mah 24A

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

MNKE IMR
IMR18650 1500mah 20A

Panasonic ​or Orbtronic hybrid
CGR18650CH (IMR/Li Ion hybrid) 2250mAh 10A
NCR18650PD (LiNiCoAl) 2900mAh 10A

Efest IMR
18650 2000mah 10A
18650 1600mAh 30A

Sony hybrid
us18650vct3 1600mAh 30A
us18650v3 IMR 2250mAh 10A

* AW IMR 18490 (1100mah) 8.8A

*AW IMR 18350 ​(700mah) 6A​

 

[Ryedan]

what is the lowest resistance in ohms can i go without using a kick1 kick2 or fuse when using AW 18490/Efest 18500

Using a Kick or a fuse in your mod will not allow you to go lower in resistance.

See Baditude's post for info on your battery capability and current draw at different resistances. I would not go less than 0.6 ohms with that battery. I like to leave room for shorts without having the battery warm up.

 

[retired1]

Moved to Rebuildable Atomizer Systems

 

[t8kiteasy]

what is the lowest resistance in ohms can i go without using a kick1 kick2 or fuse when using AW 18490/Efest 18500

batteries? currently i been using 0.7 - 1.2 ohms in the mech mod... will my batteries handle this resistance without worry of battery over draw in amperes?


thanks for any feedback

I use Efest 18650's and my limit with them is at .5,if i go below the battery tube gets hot quick so,i would stay right where you are at with a .7 build on the 18490 Efest.

EDIT: The Efest 18490's only have a 4.5 amp max discharge.

 

[zhentipede]

I like aw batts but not usually stocked in local shops..especially 18490 ..18500 imr. efest are widely available therefore I use those...
ilike to have medium batt for walk around and at work.... I use the 18650 usually when at home or long drive....

thanks for the feedback atleast now I feel better about my build.... will bump it to 0.8 and above fr9m now on until I get a hold of better batteries
once again thanks!

 

[Baditude]

EDIT: The Efest 18490's only have a 4.5 amp max discharge.

Do you have a link to your resource for this information? I would like to update my own battery resources. Thanks.

 

[zhentipede]

i pcked up this sony 30 amp what charger u guys using with this? it seems to warm up my nitecore i2 more than usual

 

[Baditude]

i pcked up this sony 30 amp what charger u guys using with this? it seems to warm up my nitecore i2 more than usual View attachment 261130 View attachment 261131 View attachment 261132 View attachment 261133 View attachment 261134

Where did you purchase those batteries? The label lettering on the shrinkwrap is much larger and different from the pics that I have seen previously of this model. That's not to say yours are not authentic, but a lot of battery countereiting is going on in China, and since this battery is so sought after it will be one of the most targeted to fake. It's also possible Sony has recently changed their labels.

2 Sony US18650VTC3 High Drain 30A Rechargeable Li on 18650 Battery 1600mAh New | eBay

US18650VTC3 1600mAh high power rechargeable battery, View US18650VTC3, US18650VTC3 Product Details from Shenzhen Victpower Technology Co., Ltd. on Alibaba.com

 

[zhentipede]

got it at a local vape shop I frequent... here in so. cali 13 buck per batt.. online is cheaper but I was impatient and wanted to try sub ohm ... it made an enormous difference ... vapes 10x better than my efest