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Multiple batteries vs Series packs

Old 10-04-2006, 01:14 AM
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FlightMedic
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Cool Multiple batteries vs Series packs

Hi all. I'm new at this so I apoligize now for my ignorance. I'm sure this has been asked a million times over but i'm stalled now as to what batteries to order. I'm just finishing up my Hanger9 P51 "Marie" .60 size plane and converting it to electric. I have everything installed except for the battery pack. I am using an Eflite Power 60 motor with a Pheonix 80 ESC. They recommend 2 TP 6000 mah 3S3P 11.1v batteries in series, but I see that TP has a new 6800 6S3P pack out. Is one better than the other or are they the same just packaged different? I'm not sure about the whole thing.
Mike
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Old 10-04-2006, 08:19 AM
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Larry3215
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They are different cells and different capacities.

I would base my choice on a couple of different things tho
1) will the single large pack fit in the plane where it needs to go for balance?

Often times, two smaller packs are easier to position to get the proper CG.

2) can you charger handle a 6S pack?

Many new chargers only do 4S or 5S max.

3)which pack(s) is lighter - weight is always a factor.

Larry
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Old 10-04-2006, 11:29 AM
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ragbag
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I like the two packs. They would be easier to mantain and replace half of your batteries should one pack go bad.
MHO
All of the above applies also, if the one pack will fit it is much easier to place in the craft than hooking up multiple packs.




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Old 10-04-2006, 03:41 PM
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FlightMedic
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Thanks you guys...I think there is plenty of room for either system. It will fit in where the fuel tank normally goes so its a pretty big area. If I do go with the two battery system, is there somewhere I can go to see how to wire it? Or can you give me some hints.

Mike
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Old 10-04-2006, 09:32 PM
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Rugar
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http://www.wattflyer.com/forums/atta...0&d=1143838784
Series connector
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Old 10-05-2006, 01:59 PM
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FlightMedic
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Thanks Rugar,

Is that homemade or can i buy that premade?
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Old 10-05-2006, 02:13 PM
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Matt Kirsch
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It's homemade.

If your P-51 is anything like my P-40 was, it's a little light on the nose, and you may need to cram as much battery weight as far forward as possible. ThunderPower likes to make the long stick packs, and that's what I'm assuming the 6S3P is. May not be a problem with that many cells, but on my 6S1P BalanceProHD 3200 pack, I also needed to move the servos out of the tail and up into the fuselage to get the plane to balance.

BTW, you really don't need 6000mAh. You'll be able to fly for about 20 minutes, but it'll be heavy. While I haven't pushed it yet, I believe I can easily exceed 10 minutes of scale flight on 3200mAh, and the plane doesn't weigh any more than its glow counterpart.
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Old 10-05-2006, 02:23 PM
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FlightMedic
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Thanks Matt,

Im really dreading spending 400+ on just the battery. Then I guess i'll need a new charger because mine is for 1-3 cell lipos.
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Old 10-12-2006, 03:03 AM
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Well I ordered my new batteries today. Decided to go with two TP5000-3SX packs and will wire them in series with the diagram you provided. This will allow me to charge them as 3 cell packs using my current charger. I'll post some pics of the plane and set-up when she's done.
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