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[rdsok]

Conventionally speaking, stacked batteries are running in series as CountSmackula's diagram shows and which doubles the voltage... But in all honesty, I can't say if running in parallel, where the amperage is doubled, is any safer or not and would avoid a situation where the batteries could have a cascade failure or not.

While the focus is currently with multi-cell batteries... I believe we are overlooking the point of the lesson these have given us which is that all batteries, single cell and up, need to be treated with the proper respect. As voltage or amperage increases, the risk associated with them increases as well. Make certain the battery or batteries you use are not showing signs of damage, do not overcharge them and do not over discharge them.

 

[rdsok]

keelalagirl55,

Physical layout isn't what determines if they are stacked... the wiring layout does... If the PV is using two batteries in series to increase voltage... then technically they are stacked.

 

[keelalagirl55]

keelalagirl55,

Physical layout isn't what determines if they are stacked... the wiring layout does... If the PV is using two batteries in series to increase voltage... then technically they are stacked.

Gotcha....now, would someone be able to tell by looking without taking a device apart how it is wired if running in parallel?

Guess I just assumed if running parallel, they had it wired that way as well then.....

 

[rdsok]

You may be able to tell by looking in the battery tray itself, in series the positive of one battery will be directly connected to the negative of the other... in parallel, the positive is connected to the positive and negative to negative.

In a PV, parallel batteries doesn't make much sense unless they are just trying to get longer battery life and not change the voltage. They would need to have a buck/boost circuit to be able to increase the voltage ( on a variable volt or watt PV ) and if they were doing that... just go with one high drain IMR type of battery and save the space and material needed for a two battery compartment.

 

[Sev00]

Gotcha....now, would someone be able to tell by looking without taking a device apart how it is wired if running in parallel?

Guess I just assumed if running parallel, they had it wired that way as well then.....

Another interesting fact. When 2 cells are connected in series (stacked), you double the voltage. When 2 cells are connected in parallel, you double the mAh. So 2 18350 batteries could be 7.4V / 900 mAh one way or 3.7 / 1800 mAh the other.

With pulse width modulation (PWM), at full pulse (top of the sign wave) , it can't exceed the voltage of the cell as I understand. So the voltage has to be higher than the available max setting of the unit. I believe for the grippy thingies, it is 7 volts. Therefore, stacked batteries.

Sev


Sev

 

[hmlessalky]

keelala, not that it doesn't exist, but I have not seen a APV that uses parallel batteries yet. They may be out there, but I have not seen one. So, with that in mind, if it has 2 batteries then chances are (SWA song) it is a 'stacked' battery device.

 

[Briar]

It takes 2 18350 batteries... so it's a stacked battery mod.

Oh. Too bad...

 

[williegntx]

These post about series and parallel should clear the air for most. While I was not completely in the dark about series vs parallel

...cells are connected in series (stacked), you double the voltage. When 2 cells are connected in parallel, you double the mAh. So 2 18350 batteries could be 7.4V / 900 mAh one way or 3.7 / 1800 mAh the other.

IMHO really nails it or should for the curious and need to be informed folks. Some great Info!

 

[BonnyC]

Yellow for me too please

And i always thought the batts this way: one on top of the other = stacked .... 2 sitting side by side was called running in parallel.... did I have a bad teacher??

You could just turn it on its side and they'd be stacked.

 

[Briar]

keelala, not that it doesn't exist, but I have not seen a APV that uses parallel batteries yet. They may be out there, but I have not seen one. So, with that in mind, if it has 2 batteries then chances are (SWA song) it is a 'stacked' battery device.

I have seen it - someplace... Some reviewer mentioned it in one of those funky mods - the one made from a mint box, maybe? I think it was SteeJan talking about it. Supposedly, the parallel configuration is safer.

BTW, folks, I don't want to give anyone the impression that I think stacked batteries shouldn't be used. Objectively speaking, while they may be statistically more dangerous, it's largely due to incorrect usage. It's just my personal irrational blip: I'm very scatterbrained about some things, and I don't trust myself to treat the batts correctly, so I'm afraid, and I don't buy stacked batt APVs. But that's just me, nothing objective about it. Objectively, if you treat the batts right, it should be fine.

 

[Sev00]

I have seen it - someplace... Some reviewer mentioned it in one of those funky mods - the one made from a mint box, maybe? I think it was SteeJan talking about it. Supposedly, the parallel configuration is safer.

BTW, folks, I don't want to give anyone the impression that I think stacked batteries shouldn't be used. Objectively speaking, while they may be statistically more dangerous, it's largely due to incorrect usage. It's just my personal irrational blip: I'm very scatterbrained about some things, and I don't trust myself to treat the batts correctly, so I'm afraid, and I don't buy stacked batt APVs. But that's just me, nothing objective about it. Objectively, if you treat the batts right, it should be fine.

Well I like my box mod to be stacked.


Sev

 

[harleydiva]

I don't have on of these.....but a couple of folks on the senior thread have them and like them a lot. They mentioned that they use PWM, and that they hit hard.....most are turning them down to lower voltages than they normally use. There is a Lord Davon review....he liked it.

 

[CountSmackula]

I have seen it - someplace... Some reviewer mentioned it in one of those funky mods - the one made from a mint box, maybe? I think it was SteeJan talking about it. Supposedly, the parallel configuration is safer.

Most, if not all VV & 5v 'box mods', whether in plastic 3xAA/4xAA format, or mint box, or any other custom body are technically "stacked" batteries. The confusion for many people is, that when they see the 2 batteries lying side-by-side, they think "parallel", but the batteries are connected + to - via a metal base plate.

Notice the battery orientation(s) in this image.

 

[bigpman]

Can't wait to see what a full kitchen will sell for....

LOL....darn auto spell.... meant to say full kit, but I guess the point came across anways

 

[badkolo]

a full kitchen is very expensive bigpman, and at the moment we are staying away form redoing full kitchens. lolol

 

[BonnyC]

LOL....darn auto spell.... meant to say full kit, but I guess the point came across anways

I thought you were making a 'The Price is Right' joke!

 

[Briar]

Most, if not all VV & 5v 'box mods', whether in plastic 3xAA/4xAA format, or mint box, or any other custom body are technically "stacked" batteries. The confusion for many people is, that when they see the 2 batteries lying side-by-side, they think "parallel", but the batteries are connected + to - via a metal base plate.
...

Yeah, the physical configuration doesn't matter, it's the circuit configuration... I am just remembering that I've seen a parallel one somewhere - just not sure where.

 

[Adrena]

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[AG51]

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I Like That Part

 

[Adrena]

Glad I got to read all that wiring stuffs <3