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HomeAircraftHelicopterMain Discussion › 7s and 5s
05-20-2018 12:24 AM  35 days agoPost 1
theriddick45

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United States

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I got a question here. Can I pear a 7s with a 5s same c and mah to make a 12s pack?

Thanks in advance!

Suzi Janis 800e & 700e 3blade both w/Ikon

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05-20-2018 12:36 AM  35 days agoPost 2
gologo

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Sedalia, Mo USA

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I wanna say yes, especially since they are both matched c-wise and capacity.

I do 6s+4s and 5s+4s regularly.......

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05-20-2018 03:05 AM  35 days agoPost 3
Flyin for Jesus

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Troy, IL. 62294

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You can pair those up... C rating doesn't matter as long as the lower C rated pack it high enough. Meaning a 55c and a 25c doesn't equal a 40c pack. It really is a 25c pack.

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05-20-2018 04:30 AM  35 days agoPost 4
theriddick45

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Ok thanks to everyone!! That clears my questions.

Suzi Janis 800e & 700e 3blade both w/Ikon

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05-20-2018 12:08 PM  35 days agoPost 5
ICUR1-2

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Ottawa, Ontario

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I have never heard of pairing different cell count batteries.
I was always told they had to be the same.

spending time, paying attention

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05-20-2018 12:52 PM  35 days agoPost 6
wjvail

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Meridian, Mississippi

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ICUR1-2
I have never heard of pairing different cell count batteries.
I was always told they had to be the same.
Putting them in series is fine. 7s and 5s to make a 12s - notice the "S"es.

I would avoid putting them in parallel. If you do try putting a 7s and 5s in parallel (making a 6s2p?), could you film it for me? It should be spectacular. To be clear, DON'T put these packs in parallel. The 29.4 volt 7s will try and "charge" the 21 volt 5s.

If you'd like to experiment with this, try plugging in a 3s and 6s battery on your parallel charge board at the same time.

"Well, Nothing bad can happen now."

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05-20-2018 11:39 PM  34 days agoPost 7
ICUR1-2

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Ottawa, Ontario

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Thanks for the explanation

Series o.k.
Parallel bad got it.

spending time, paying attention

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05-21-2018 06:05 AM  34 days agoPost 8
theriddick45

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Nice!!! Thanks again!

Suzi Janis 800e & 700e 3blade both w/Ikon

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05-21-2018 11:36 AM  34 days agoPost 9
Richardmid1

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Leeds, England

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C rating does matter here. The higher C rated pack (or the pack with lower IR) will actually discharge quicker than the other pack, which is fine as that pack CAN discharge quicker with no problems. I'm not talking a huge difference, it's only slight so nothing to worry about.

60% of the time, it works every time!

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05-21-2018 02:44 PM  34 days agoPost 10
Flyin for Jesus

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Troy, IL. 62294

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Richardmid1
C rating does matter here. The higher C rated pack (or the pack with lower IR) will actually discharge quicker than the other pack, which is fine as that pack CAN discharge quicker with no problems. I'm not talking a huge difference, it's only slight so nothing to worry about.
This is incorrect.

If you had packs in parallel and one has a lower IR, that pack would maintain voltage batter and more mAhs would come out of it compared to the other pack.

In series, mAh is mAh. If you draw out 1000mAh, you have done so to each cell. Even if IRs are different. If one cell voltage sags more than the others, it will drop the total voltages the 12s pack, but current will not change in individual cells, they all remain the same.

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