Battery Chemistry

[sonicbomb]

Hello and welcome, both those batteries are good chemistry, both are 20 amp CDR cells. You need to make sure you do not over tax your batteries to remain safe.

Coil resistance is not important in this calculation. On a regulated mod like the RX200 as the voltage falls, the mod will increase the amp draw to maintain the selected wattage. You need to know the amp draw at full charge, and when the battery is discharged as this value will be the highest. Most regulated mods are about 90% efficient, so you will also need to factor this loss into your calculations. A fully charged battery is 4.2v, the cutoff for most mods is 3.2v.
The RX200 has three batteries so divide the final value by 3

To find the amp draw use I=P/V (-10%)
50w divided by 4.2v equals 11.9 divided by 0.9 = 13.22 amps
50w divided by 3.2v equals 15.6 divided by 0.9 = 17.33 amps

You can use Battery drain to model this.
I wouldn't go above 150 watts as this gives you some safety headroom.

150w divided by 3.2v equals 46.86 divided by 0.9 = 52 amps (divide by 3 = 17.3 amps per battery)


Unless you were already aware ECF has a resident battery tester, check his blog for the skinny on any cells you might be interested in buying.
List of Battery Tests | E-Cigarette Forum

 

[edyle]

That is great news. I was killing atomizers quick on my Nautilus. Like a few days sometimes.

That happens to just about everybody; that's why we end up with rebuildables.
It's not so much the coil itself, it's the wick and the gunk that collects in the coil/wick.

With rebuildables every few days you just take out the old wick, dryburn the coil to clean it, and put in a new wick.

With the new tanks out nowadays that come with rebuildable heads, you keep a set of rba heads ready and when you need to change coil you just swap out coils, and set aside the used coil for dryburn/rewick when you are ready.

 

[revterry]

Hello and welcome, both those batteries are good chemistry, both are 20 amp CDR cells. You need to make sure you do not over tax your batteries to remain safe.

Coil resistance is not important in this calculation. On a regulated mod like the RX200 as the voltage falls, the mod will increase the amp draw to maintain the selected wattage. You need to know the amp draw at full charge, and when the battery is discharged as this value will be the highest. Most regulated mods are about 90% efficient, so you will also need to factor this loss into your calculations. A fully charged battery is 4.2v, the cutoff for most mods is 3.2v.
The RX200 has three batteries so divide the final value by 3
...

Great info thanks!

 

[revterry]

That happens to just about everybody; that's why we end up with rebuildables.
It's not so much the coil itself, it's the wick and the gunk that collects in the coil/wick.

With rebuildables every few days you just take out the old wick, dryburn the coil to clean it, and put in a new wick.

With the new tanks out nowadays that come with rebuildable heads, you keep a set of rba heads ready and when you need to change coil you just swap out coils, and set aside the used coil for dryburn/rewick when you are ready.

I have been using the RBA on my Kanger Subtank v2, the taste has been great and I have been getting better at rewicking. Just haven't been very happy with the kanger for several reasons. I guess the is a RBA available for the crown as well so Ill have to pick one up.

 

[Baditude]

If you wish to learn the technicalities of battery chemistry read:

Deeper Understanding of Mod Batteries Part 1

Battery Basics for Mods: The Definative Battery Guide for Vaping