help on upgrading to mod and rba

[raqball]

OK i'm looking into rba building and I know enough to realize 0.3 ohms is crazy low but what is wrong with a 18490 for this situation? batteries are my current what i'm trying to get a grasp on, is it an amp limitation issue?

There are plenty of different chats out there but this one is pretty good in my opinion..

 

[NumberOneBatfan]

So fresh 18490 is like 4.2v, 0.3 ohm coil = 58.8w and 14 amps, Horrid i get, is there a safe battery he could have used? Isn't any 18xxx battery going to be a death trap? Is the lesson that there was no possible battery to hand him? I kind of just read it as there was a possible choice, 18490 just wasn't it.

 

[bfrie]

you can run .5 ohms on any 3.7v battery and still be under 10 amps, which is what most of them are rated for anyway. if you go lower than that, get panasonics, orbtronics, MNKE's, or sony 30 amp batts. all of these can handle sub half ohm vaping. with RBA's, the safe vaping chart is nul and void, i vape 20+watts all the time

 

[bfrie]

and btw, .5 ohm vaping is more than enough for me. i usually run around .6-1 ohm. another thing to remember is voltage drop. every mechanical and battery have internal resistance that cause the voltage under load to lower. the lower your resistance, the more volts you lose under load, so you will never actually get 4.2v out of a fresh battery. 3.8 is much more realistic to expect if your lucky at that low of resistance, bringing your watts on a .3 coil down to 48.1 and amps down to 12.5, which is just barely outside of what an aw imr is rated for. and those are very optimistic expectations out of a mechanical

 

[NumberOneBatfan]

Awesome replies! So like 10 amps max on aw batts. It wasn't the 18490, it was that aw batts aren't rated for the amps. If he had offered your above mentioned batts, it might have been ok. I don't see myself going sub ohm anytime soon but all very helpful information, thanks bfrie. I love this place.

 

[Ryedan]

you can run .5 ohms on any 3.7v battery and still be under 10 amps, which is what most of them are rated for anyway. if you go lower than that, get panasonics, orbtronics, MNKE's, or sony 30 amp batts. all of these can handle sub half ohm vaping. with RBA's, the safe vaping chart is nul and void, i vape 20+watts all the time

If you meant the Panasonic CGR18650CH, which I believe are re-branded by Orbtronics, they are 10 A also. The MNKE's are rated for 20.

 

[bfrie]

If you meant the Panasonic CGR18650CH, which I believe are re-branded by Orbtronics, they are 10 A also. The MNKE's are rated for 20.

the ncr not cgr. also they are rated for 10 amp continuous discharge, 18 amp pulse discharge. pv's are typically fired for 3-12 seconds, making it more of a pulse discharge than a continuous discharge, which is more like use in a flashlight

 

[bfrie]

Awesome replies! So like 10 amps max on aw batts. It wasn't the 18490, it was that aw batts aren't rated for the amps. If he had offered your above mentioned batts, it might have been ok. I don't see myself going sub ohm anytime soon but all very helpful information, thanks bfrie. I love this place.

10 amp max on most batteries out there actually, not just aw's. however, i have heard that the aw 18650 1600 mah batteries (NOT the 2000 mah ones) are rated for higher than 10 amps, have not confirmed this with my own research, so dont push higher than 10 amps on these until you can confirm it.

 

[NumberOneBatfan]

I think i'll just make it a rule to stay under 10 amps, for now at least. Thanks again.

 

[bfrie]

yea you get a plenty good hit at .8 anyway, and that way you dont blow your face off