Dual Battery Mod Question

[grim]

due to the vast knowledge on this forum and the wide array of questions asked I cannot find an exact answer.

I understand how ohms law works on my single battery set up but I'm looking at a mod that's 150 watts and runs a dual battery set up.

After researching the Sigelei 150 watt TC I see there is also a 200 watt model. I've only just begun using kanthal and building coils and I'm perfectly happy at my 0.5 ohm experience. I would be ok not pushing it lower than 0.4.

My question is, seeing as I'm using kanthal and I will go nowhere near 100 watts, which batteries would be safe in a dual set up. One site warned to not use batteries rated less than 30A continuous but I've read others say they are using dual 20A or 25A ones in this exact mod. I mean, I can't imagine pushing this thing even close to 150 watts let alone 100.

Can I use my LG HG2s or HE4s as long as I buy them new in sets or do I really need 30A continuous for this mod?

Irritating me that all these new mods are in extreme wattage zones I don't even think they make batteries for to be even considered safe.

 

[MMcQ]

To figure this out you would need to use Watt's law. This question is very similiar to one posted a couple days ago Need help to grasp current (Amps)

 

[MMcQ]

For a quick answer 2 20 amp batteries should be able to handle up to *Edit 92.1 watts regardless of resistance in a regulated mod.

 

[grim]

I'll check out that link.

I'm trying to learn as much as I can and be as safe as possible. I've grasped ohms law fairly well and try not to push even close to the limit.

Only reason I'm concerned is I've read several posts about the inherent dangers of multiple battery set ups and understand even in these regulated devices using multiple batteries can spell disaster if you push the limits but it seems most of the mods I like (mainly so I can try different materials and builds) are all 100+ watts with two or more batteries involved.

 

[sonicbomb]

On a regulated device the coil resistance is irrelevant, only wattage is important. You need to calculate what the amp draw will be when your batteries are discharged at your chosen wattage, and make sure that this is less than the CDR of your battery/s. If you have two batteries, divide the calculated amp draw by two.

Ohms Law - Calculating safe amp usage | E-Cigarette Forum

ECF has a resident battery tester by the name of Mooch. Check his blog for info on the true performance of any batteries you may want to use/
18650 Battery Ratings -- Picking a Safe Battery to Vape With | E-Cigarette Forum

 

[Clydde26]

All batteries right now are 20A continuous. So your fine. LG Hg2s are right on par with vtc4s the 25r is a good battery as well just doesn't stack up as well as the other 2. The 35a is the initial power which is why almost all batteries have a rating of 35a/20a. The 20 is the continuous drain. Any build above .5 ohms and you will be fine with almost all batteries on the market.

 

[sig-cmt]

The Sigelei 150W TC likely has similar current and voltage limits as the non-TC variant: 30A at 5V with a 0.167Ω build. If you plan to build near that resistance and have enough coil mass which requires 150W to meet your desired vaping experience, then I would opt for 30A cells.

 

[sonicbomb]

All batteries right now are 20A continuous.
The 35a is the initial power which is why almost all batteries have a rating of 35a/20a.
Any build above .5 ohms and you will be fine with almost all batteries on the market.

@Clydde26
Not true. There are batteries with far lower CDRs, and also higher. The LG HB2/4/6 being examples of 30 amp batteries
Not true. What you are referring to is the pulse rating, which for the the purposes of safe battery usage can be discounted.
Not true. There are plenty of batteries on the market with a chemistry and CDR unsuitable for 0.5 ohms (on a mech).

 

[edyle]

due to the vast knowledge on this forum and the wide array of questions asked I cannot find an exact answer.

I understand how ohms law works on my single battery set up but I'm looking at a mod that's 150 watts and runs a dual battery set up.

After researching the Sigelei 150 watt TC I see there is also a 200 watt model. I've only just begun using kanthal and building coils and I'm perfectly happy at my 0.5 ohm experience. I would be ok not pushing it lower than 0.4.

My question is, seeing as I'm using kanthal and I will go nowhere near 100 watts, which batteries would be safe in a dual set up. One site warned to not use batteries rated less than 30A continuous but I've read others say they are using dual 20A or 25A ones in this exact mod. I mean, I can't imagine pushing this thing even close to 150 watts let alone 100.

Can I use my LG HG2s or HE4s as long as I buy them new in sets or do I really need 30A continuous for this mod?

Irritating me that all these new mods are in extreme wattage zones I don't even think they make batteries for to be even considered safe.

what if your mod gets set to 150w unintentionally?

 

[Baditude]

@Clydde26
Not true. There are batteries with far lower CDRs, and also higher. The LG HB2/4/6 being examples of 30 amp batteries
Not true. What you are referring to is the pulse rating, which for the the purposes of safe battery usage can be discounted.
Not true. There are plenty of batteries on the market with a chemistry and CDR unsuitable for 0.5 ohms (on a mech).

I agree with Sonic on all counts.

 

[Tol]

Check out Mooch's Blog post on calculating current draw: Calculating-battery-current-draw-for-a-regulated-mod

Max Amps Per Battery = (Max Wattage Per Battery / Minimum Voltage Per Battery) / Mod Efficiency (0.95 for 95%, 0.90 for 90%, etc...)
so something like 100 watts total - 50 watts per battery/3.2 volts/.9 =17.36 amps or you can just do them together like 100 watts/6.4 volts/.9 = 17.36 amps

You can also calculate this on Steam Engine using the Battery Drain tab