Parallel Sony VTC5

[Unnatural]

So, I'm pretty new to vaping and I've recently got myself an Eleaf iStick TC100W. Been looking for a pair of batteries too and got myself a bit cornered.
Sony VTC5 batteries are rated at 20A (according to tests). Eleaf reccomends 25A+ rated batteries (such as quite rare VTC4).
Since the mod's batteries are parallel, using strictly both should be quite below VTC5's rating and perfectly safe, right?

 

[Eskie]

It depends how much current you plan on drawing. For that mod the VTC5's will be fine up to ~60W. Any higher and you're better off with a series device.

 

[Unnatural]

It depends how much current you plan on drawing. For that mod the VTC5's will be fine up to ~60W. Any higher and you're better off with a series device.

To my knowledge, using batteries in parallel splits the current draw between them. So if I'd be to draw 100W at 3.7V (VTC5 rating), I should be getting around 27A. Split that by two and you get around 13.5A per battery. Or am I wrong?

 

[Topwater Elvis]

Using a regulated power device parallel / series makes no difference when calculating battery amp demand.

--->Calculating battery current draw for a regulated mod | E-Cigarette Forum

Vtc5A - 25a CDR.

 

[Eskie]

The load is not split in parallel, but the mAh will be double. 100W at 3.7A ~29A (10% allowing for efficiency of the mod). And if you want to assure safety, you should judge the current load based on the lowest the mod will discharge to, usually ~3.2V.

In series, the voltage would double and the load would be shared between the batteries.

 

[Unnatural]

Using a regulated power device parallel / series makes no difference when calculating battery amp demand.

--->Calculating battery current draw for a regulated mod | E-Cigarette Forum

Vtc5A - 25a CDR.

Seems like your given link proves my point. The two batteries would only give out half the amps each and would be within their limits.
I'd love to get a pair of VTC5As, but due to market being quite limited in my country, I have to choose between VTC5, VTC6 or SAMSUNG INR 18650 25R and some XTAR batteries, whose specs are unclear.

 

[Hawise]

Seems like your given link proves my point. The two batteries would only give out half the amps each and would be within their limits.
I'd love to get a pair of VTC5As, but due to market being quite limited in my country, I have to choose between VTC5, VTC6 or SAMSUNG INR 18650 25R and some XTAR batteries, whose specs are unclear.

Yes, according to Mooch (the guy who wrote the post in the link) a 20A battery would give you 55w - 60w per battery on a regulated mod, which makes you good to the 100w limit of your device.

Mooch also has a list of recommended batteries, complete with the results of his own tests:

Mooch's Recommended Batteries | E-Cigarette Forum

Based on that, you should go with the VTC5 or Samsung 25R. The VTC6 should also do if you go with Mooch's rating rather than the official specs, and would give you extra capacity. The XTAR batteries will be rewraps, so even if you find specs for them you can't necessarily trust them.

 

[Unnatural]

@Hawise , best comment so far. I'll be going with the VTC5s then. 6s seem a bit too risky.

 

[Joergl100]

The load is not split in parallel, but the mAh will be double. 100W at 3.7A ~29A (10% allowing for efficiency of the mod). And if you want to assure safety, you should judge the current load based on the lowest the mod will discharge to, usually ~3.2V.

In series, the voltage would double and the load would be shared between the batteries.

Sure the load is split! 2 20A CDR-batteries in parallel is the same as one battery with 40A CDR AND the available energy is also doubled.

 

[Unnatural]

Sure the load is split! 2 20A CDR-batteries in parallel is the same as one battery with 40A CDR AND the available energy is also doubled.

I think that using therefore instead of and would be more appropriate, since the equation is something like: time = mAh/(ampDraw*1000).

 

[Imfallen_Angel]

So, I'm pretty new to vaping and I've recently got myself an Eleaf iStick TC100W. Been looking for a pair of batteries too and got myself a bit cornered.
Sony VTC5 batteries are rated at 20A (according to tests). Eleaf reccomends 25A+ rated batteries (such as quite rare VTC4).
Since the mod's batteries are parallel, using strictly both should be quite below VTC5's rating and perfectly safe, right?

The TC100W is my go-to mod for over a year (and we are now up to 6 of them in my house, so yes that DOES make me an expert for this mod), great mod!

At 20A per batteries, since in parallel, you have 40A, and can go up the the 120W (if you updated the firmware) without breaking a sweat with this mod (though I seldom go over 70W, I mostly stick to around at 45W).

I've used it with all my tanks (over a dozen+) with no issues, except with my Conqueror where I had to make a small rubber gasket as it was sticking up a bit too much for comfort. (it's 510 pin is the longest in all my tanks)

If you're building decks that requires more than 70-80 watts, I'd recommend that you switch to a smaller wire (gauge 26-28) and you'll get plenty of kicking power.

I've been switching to the LG 3000mAh (HG2) and those are 20A, and I've yet to have any issues whatsoever.

Note that I always charge via all my mods too, so I can confirm that it's a reliable mod.

 

[KenD]

So, I'm pretty new to vaping and I've recently got myself an Eleaf iStick TC100W. Been looking for a pair of batteries too and got myself a bit cornered.
Sony VTC5 batteries are rated at 20A (according to tests). Eleaf reccomends 25A+ rated batteries (such as quite rare VTC4).
Since the mod's batteries are parallel, using strictly both should be quite below VTC5's rating and perfectly safe, right?

Two 20-amp batteries are fine up to about 120w on most regulated mods so you'll be fine. Btw, the vtc4 is a 23 amp battery. The Sony vtc5a (not vtc5) is 25 amps, and LG hb2, 4, and 6 are 30 amps - should you ever need higher rated batteries.



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[KenD]

To my knowledge, using batteries in parallel splits the current draw between them. So if I'd be to draw 100W at 3.7V (VTC5 rating), I should be getting around 27A. Split that by two and you get around 13.5A per battery. Or am I wrong?

With regulated mods the amp draw per battery is the same whether in series or parallel. In parallel mods the load is indeed divided between the batteries, but in series mods the available voltage is multiplied by the number of batteries, requiring less amps. The calculation (simplified) is:

Watts / cutoff voltage = amps

Two-battery parallel:
60w / 3v = 20 amps. Divided by two = 10 amps per battery

Two-battery series:
60w / 6v (two batteries at 3v) = 10 amps (per battery)



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[Unnatural]

@KenD , I've never heard of parallel mods. You probably meant regulated vs unregulated.

 

[Topwater Elvis]

No, there are power devices that use batteries in parallel.
Both regulated & mech/unregulated.

 

[KenD]

@KenD , I've never heard of parallel mods. You probably meant regulated vs unregulated.

Some multiple-battery mods have the batteries setup in parallel (like the Therion 75 - not the Therion 133 or 166 - and your iStick tc100w) and others in series (most multiple-battery mods).

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[Imfallen_Angel]

@KenD , I've never heard of parallel mods. You probably meant regulated vs unregulated.

Then you should have looked up the TC100W, it's one of the very few parallel regulated mods there is... For DNA board, there's the Lost Vape Therion that's aslo a parallel.

That's why I have so many, I prefer the idea and way parallel works, and I don't really need to go over 75W. (while the TC100W can go up to 120W).

 

[Eskie]

Sure the load is split! 2 20A CDR-batteries in parallel is the same as one battery with 40A CDR AND the available energy is also doubled.

Sorry, I should have qualified that as in an unregulated mod.

 

[Joergl100]

Examples mech:

2 batteries parallel, 4 volts each, atomizer 0.2 ohms:

The occuring power will be (4 volts*4 volts)/0.2 ohms=80 watts.

Occuring load will be 80 watts/4 volts=20 amps.

Load for each battery will be 10 amps.



2 batteries serial, 4 volts each, atomizer 0.8 ohms:

The ooccuring power will be (8 volts*8 volts)/0.8 ohms=80 watts.

Occuring load will be 80 watts/8 volts=10 amps.

Load for each battery will be 10 amps.

 

[Unnatural]

No, there are power devices that use batteries in parallel.
Both regulated & mech/unregulated.

Sorry, your previous post was rather confusing and I thought you're trying to compare regulated vs unregulated.

Anyways, if in regulated mods the amps do not split between the batteries, how do these mods work? Does the regulator draw full power and then decides how much it should put through the coil? Where does it put the extra power, if that is the case?