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Old Feb 09, 2016, 05:30 PM
ko4nrbs is offline
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7.4 volt 2S4P Pack

Can someone recommend a good 7.4 volt 2S4P Pack 3000maH or more capacity and where to purchase them? We need some for a new project.
Bill
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Old Feb 09, 2016, 06:35 PM
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It actually has to be 4P?? Without that spec, then it can be any old lipo. I'm just wondering if you got that suggestion from some old manual that predates big lipo cells.
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Old Feb 09, 2016, 10:28 PM
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Are you looking for a 7.4 volt 12000 mAh pack or a 7.4 volt 3000 mAh pack?
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Old Feb 10, 2016, 12:44 AM
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Quote:
Originally Posted by ko4nrbs View Post
Can someone recommend a good 7.4 volt 2S4P Pack 3000maH or more capacity and where to purchase them? We need some for a new project.
Bill
Why 4p? Extra cost and complexity running so many in parallel when 3000mah cells are pretty common.
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Old Feb 10, 2016, 08:47 AM
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Originally Posted by kamcoman View Post
Are you looking for a 7.4 volt 12000 mAh pack or a 7.4 volt 3000 mAh pack?
A 12000 would last a lot longer in the field. We are going to use them to power slave flashes for Game Cameras.

Bill
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Old Feb 10, 2016, 08:48 AM
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Why 4p? Extra cost and complexity running so many in parallel when 3000mah cells are pretty common.
We are trying to get as long a life as we can while they are out in the field.
Bill
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Old Feb 10, 2016, 10:42 AM
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What people are trying to tell you Bill is that the question doesnt make sense.
If you want a 3000mAh 2S pack, these are readily available, as two 3000mAh cells in series.
You specifically state that you want a 4P pack.
No-one to my knowledge will make combined cells from four parallelled 750mAh cells these days, because 3000's are readily available.
As for long life, do you mean long-term cycle life or discharge time?
Neither "1P 3000" cells or "4P 750" cells will have any advantage over the other.
Cheers
Phil
Edit: cross posted. I see you actually want a 12000, not a 3000:
Choose a pair of any of these and parallel them.
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Old Feb 10, 2016, 12:30 PM
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Originally Posted by phil_g View Post
What people are trying to tell you Bill is that the question doesnt make sense.
If you want a 3000mAh 2S pack, these are readily available, as two 3000mAh cells in series.
You specifically state that you want a 4P pack.
No-one to my knowledge will make combined cells from four parallelled 750mAh cells these days, because 3000's are readily available.
As for long life, do you mean long-term cycle life or discharge time?
Neither "1P 3000" cells or "4P 750" cells will have any advantage over the other.
Cheers
Phil
Edit: cross posted. I see you actually want a 12000, not a 3000:
Choose a pair of any of these and parallel them.
Well I'm new to this so my ignorance is confusing me.

Thanks for the link.
Bill
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Old Feb 10, 2016, 09:30 PM
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Originally Posted by ko4nrbs View Post
Well I'm new to this so my ignorance is confusing me.

Thanks for the link.
Bill
Perhaps this will help explain some things. http://www.tjinguytech.com/charging-how-tos

Glen
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