Question About Li-Poly Batts

[A_Supple_Leopard]

Hi all,

I'm new to vaping and mods, but I've always been a DIY person and been lurking this forum for a while. Thanks to some of the great modders here, I feel comfortable starting on my own mods.

Just had a question regarding li-poly batteries, more specifically, which ones are safe to use. I'm seeing the different discharge rates 15c, 25c, etc. How high of a discharge rate can I use? Also, I see they come in 3.7v, 7.4v and 11.1v, with a DNA20 board, can I use any of these or must it be a 3.7v as I've seen other mods use?

Thanks for all your help in advance!


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[dr g]

DNA20 is a single-cell board (1S).

 

[Azmo]

Hi all,

I'm new to vaping and mods, but I've always been a DIY person and been lurking this forum for a while. Thanks to some of the great modders here, I feel comfortable starting on my own mods.

Just had a question regarding li-poly batteries, more specifically, which ones are safe to use. I'm seeing the different discharge rates 15c, 25c, etc. How high of a discharge rate can I use? Also, I see they come in 3.7v, 7.4v and 11.1v, with a DNA20 board, can I use any of these or must it be a 3.7v as I've seen other mods use?

Thanks for all your help in advance!


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You want a 3.7v battery. But you can wire as many 3.7v batteries as you want in parallel and still be at 3.7v. Not to confuse you, but it is possible to turn a 7.4 or 11.1 battery into a 3.7v battery. A 7.4 is just two 3.7's wired in series and an 11.1 is three in series. But to make them 3.7, you would have to rewire the cells.

As for the discharge rate, higher is better, just not necessary. A very low discharge rate is where you will have problems. A 15c is plenty.

 

[A_Supple_Leopard]

Thanks for the clarification! I was a bit unsure on the voltages.

I'll be sure to post my build once it's complete.


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[DrMA]

The C rating of LiPo batts specifies how much current they can deliver as a function of their nominal capacity. So a 1000mAh battery at 15C means it can supply 15x1000mAh=15A of current. That's about twice as much as you'll ever need in a vaping setup.

 

[A_Supple_Leopard]

Just ordered four Turnigy 1200mAh 15c round Nano-Techs, along with a couple DNA20D boards and charging boards.

Slowly compiling my list of parts, can't wait to start building.


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[Matthew Keller]

I have been pondering using 7.4v round Lipo packs. What I wonder is after you rewire them from series to parallel, what would be the mah rating and C rating? Would it change?

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[inter_ceptor00]

I have been pondering using 7.4v round Lipo packs. What I wonder is after you rewire them from series to parallel, what would be the mah rating and C rating? Would it change?

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Directly proportional. For example...if your 7.4V pack (2-3.7V batteries wired in series) is listed as 2000MaH, it contains 2 3.7V 2000MaH batteries. If you take them and wired them in parallel, you would have a 3.7V 4000MaH battery pack. C-rating would remain the same in both sets.

Also C-rating depends A LOT on the battery itself. A cheap LiPo is only rated at 1C. AW brands list themselves as having up to 20C Discharge rates. Also keep in mind that discharging at more than 1C reduces the run-time. A 3.7V 2000Mah battery discharges 3.7V at 1amp for 2 hours. 2amps would drain it in 1 hour, etc.