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Is it possible to run 4 IMR’s in series / parallel to get the power an


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#1 Flash243

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Posted 14 December 2017 - 04:58 PM

I have a newly bought Nerf Stryfe. Seemed to be the one to get to modify and have a little fun with. Anyway Ive seen a lot about running 2 or 3 IMRs with dummies. I guess getting around 7.4 or 11.1 volts running in series? I think maybe it was parallel? (Im def not an electrician by any means) But only around 700mah depending on the type and brand. Which I see a lot of other posts saying isnt enough. How about running 4 in series and parallel? It would only be aboutt 7.4volts but would double the MAH to 1400? This is all approximated on 14500 IMRs I ordered by EFest rated at 700mah. I trust EFest and use them in ecigs. I just think it would be nice that even no door mod needed and a nice full factory tray obviously rewired would look nice. Ive looked around a bunch of forums and not found anything about doing this specifically. Is it possible? And if so could someone maybe post a wire diagram for it? Forums are great I have learned so much but am new to being a poster. Please excuse me if I have done anything out of line or not in the right order but Id really like to see if this is possible. And run with it. Can anyone help?
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#2 Draconis

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Posted 14 December 2017 - 08:06 PM

Yes, you can run cells in parallel to increase the current supply and charge capacity.  In that case, yes, your storage capacity doubles from 700mAh (proper capitalization is important for these units) to 1400mAh.  If you place them in series, then the voltage doubles, while the charge capacity remains at 700mAh.  The notation is thus: 1s1p = 1 x 3.7v @ 1 x 700mAh, 1s2p = 1 x 3.7v @ 2 x 700mAh, 2s1p = 2 x 3.7v @ 1 x 700mAh.


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#3 Flash243

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Posted 15 December 2017 - 01:12 PM

Ok so my question is I guess? I want a 2s2p = 2 x 3.7v @ 2 x 700 mAh = 7.4v @ 1400 mAh. How would I wire that up? I saw an explanations for diagram in another forum for batteries and wiring in general. Nothing to do with dart guns. And it really didnt look good. I took a screen shot of this and added it. I know these IMR batteries are known to explode if discharged/wired incorrectly. Can anyone provide a wiring diagram or schematic for this or even possibly a picture showing how it would be wired up?

6D514050-AAD6-4E38-A86F-C09963BAD808.png
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#4 Flash243

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Posted 16 December 2017 - 12:56 PM

I should have put this in my reply above. But Is the diagram above more or less how it would look wired up? And is it safe for these kinds of batteries?
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#5 Quack

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Posted 17 December 2017 - 02:37 PM

I should have put this in my reply above. But Is the diagram above more or less how it would look wired up? And is it safe for these kinds of batteries?

 Yeah that diagram looks fine. But if you're really going through this much trouble with an imr setup you might as well just get a lipo and buy and extended tray for like $5.00. cutting the little fins out of the battery tray to fit a lipo isn't really that hard. I think it's a cool idea but it just seems impractical.


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#6 Draconis

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Posted 21 December 2017 - 04:51 PM

I should have put this in my reply above. But Is the diagram above more or less how it would look wired up? And is it safe for these kinds of batteries?

 

Yes, that diagram is an accurate representation of one style of completed pack.  Alternatively, you could wire each pair in series, then the pairs in parallel.  Basically ends up the same, but if you pair them up well, you will have less charge balancing issues.  Laptop battery manufacturers typically build as you have described.  Hybrid/electric car manufacturers typically build as I have.


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[15:52] <+Noodle> why is this so hard?


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