Panzer Black hawk 0.3 ohm

[stephen243]

hi i have a panzer black hawk which i have just built the rda to 0.3ohm with 2 coils now i was running 2 efest 18350 800mAh 3.7 volt batteries so it was 1600mAh and 7.4 volt combined now i was getting very good vapour but the batteries seem to get slightly warm even after a couple of puffs so i was advised to run a efest 18650 2500mAh 35a battery which stays cool but the vapour is no where near as good not even half i think its down to the coils not getting as hot.

just wanted a bit of advice as to weather it will be safe to run the 2 18350s or if i am asking for trouble and why am not getting much vapour with the 18650

 

[KenD]

Were you stacking those 18350s? That's never a good idea (and you're not doubling the mAh, only the voltage), and with an .3 ohm coil you're way above the amp rating of those batteries. You're pulling 28 amps from batteries that are rated for 10.5 amps. With a single battery you have half the volts, which explains why you're getting less vapour, but you are drawing 14 amps (a fully charged battery is at 4.2v) which is within the amp limit of the 2500 mAh efest (the discharge rating for that battery is 20 amps, not 35).

I would seriously suggest that you familiarize yourself with battery safety (read Baditude's battery blogs here at ECF) and ohms law.

 

[rhelton]

Its good that you stopped and asked many people do not. Those cells are getting warm because your asking them to discharge faster than they were designed too. If you do that too many times they may not recharge from damage, and a worse case is one of them vents and you will be cleaning toxic material from your mod and may even burn your self badly.

If you like high voltage vaping like I do then get yourself a high watt device like a IVP2, IPV3, Segelei 100w etc. I love high power vaping its awesome and you can do it safely with the right equipment.

100.00 or less in most cases

 

[classwife]

Moved to Batteries and Chargers from the Modding Forum - Battery Mods

Forum: Modding Forum
The home of modders - the builders or modifiers of custom ecigs.

 

[Ryedan]

hi i have a panzer black hawk which i have just built the rda to 0.3ohm with 2 coils now i was running 2 efest 18350 800mAh 3.7 volt batteries so it was 1600mAh and 7.4 volt combined now i was getting very good vapour but the batteries seem to get slightly warm even after a couple of puffs so i was advised to run a efest 18650 2500mAh 35a battery which stays cool but the vapour is no where near as good not even half i think its down to the coils not getting as hot.

just wanted a bit of advice as to weather it will be safe to run the 2 18350s or if i am asking for trouble and why am not getting much vapour with the 18650

With two batteries in series, battery mAh and battery maximum amp output stay the same, but the voltage is doubled.
With two batteries in parallel, battery mAh and maximum amp output are doubled, but the voltage stays the same.

It is not safe to run those 18350 batts in a mech mod at 0.3 ohms. Go to the Steam Engine battery drain calculator. Click on "unregulated (mech)", enter 0.3 ohms for atomizer resistance, 8.4V for two batteries in series and you'll see in "Battery drain" the current from each battery is 28 amps. Power is 235 watts, which is quite high

The Efest 18350 has a max amp rating of 6.4A and you were drawing 28A from each with fully charged batts. You're very lucky they didn't vent.

Go back to the Steam Engine calculator and make the voltage 4.2 like you get with a single fully charged batt. At 0.3 ohms current draw is 14A and power is 56 watts. This is my all day vape setup exactly and I'm quite happy with that performance. Your Efest 18650 2500 mAh is actually a 20A max battery. At 0.2 ohms you'll be drawing 21 amps, so I would not recommend you go lower than 0.3 ohms to give you some leeway if your meter is out a bit. A 30A battery will allow you to go down to 0.2 ohms and that will take the power up to 88 watts.

I don't know how experienced you are with RDAs, but you should be getting a lot of vapor from the 0.3 ohm setup if it's done right. If you want to, post a couple of clear pictures of your RDA setup and maybe we can help you optimize the build.

 

[KenD]

Were you stacking those 18350s? That's never a good idea (and you're not doubling the mAh, only the voltage), and with an .3 ohm coil you're way above the amp rating of those batteries. You're pulling 28 amps from batteries that are rated for 10.5 amps. With a single battery you have half the volts, which explains why you're getting less vapour, but you are drawing 14 amps (a fully charged battery is at 4.2v) which is within the amp limit of the 2500 mAh efest (the discharge rating for that battery is 20 amps, not 35).

I would seriously suggest that you familiarize yourself with battery safety (read Baditude's battery blogs here at ECF) and ohms law.

There was an error in my earlier post. As Ryedan pointed out the red 800 mAh Efest 18350s have an amp limit of 6.4. That means that you you were over four times their amp limit. I misread you and thought you were using the newer purple Efest 18350s. You'd still have been way over their amp limit though.