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Old 05-15-2006, 05:06 PM   #11
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I wish we could have accurate power density specs for these batteries. This takes more characteristics that matter into account and helps answer the question, "Am I better off with more of these lighter 10C cells or fewer of these heavier 15C cells.


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Old 05-15-2006, 09:04 PM   #12
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For me it's often more about what will fit better, and how I can position the pack for CG.

My LHS (Pinnacle) is more than happy to weigh packs before you decide, in fact, they even offer assistance and a watt meter to help choose the right prop before buying.
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Old 11-11-2006, 09:48 AM   #13
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Re: Lipos overheating

Originally Posted by Sirantony
I am building a Multiplex superstar II. I want to fly it with a lipo battery.
I replaced the two motors with speed 400 7.2 volt, and am using two graupner 6x3 folding props
I connected up a Kokam 3s 1500 lipo to tach rpm which were approximately in the 9000 range..................
I see you are running a 7.2 volt motor with a 3 cell lipo 11.2 volt battery. Perhaps dropping down to a 2 cell with a higher capacity or discharge rate along with a watt meter would be a good idea.
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Old 11-11-2006, 12:07 PM   #14
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Almost every manufacturer grossly overstates true discharge rating so you need to keep that in mind when shopping for packs.

A lot of the batteries rated at 20C can barely do it as is.

Yes, they'll discharge at 20C currents without bursting into flames (so technically, the technology advancement is there). But using a pack at true 20C currents will give you a VERY low cycle life, not to mention serious voltage sag under load.

Just about every manufacturer tends to exaggerate their amp ratings. This applies to both batteries AND speed controllers in my experience, so always get more than you think you'll need so you've always got the extra room. Cutting it close is never a good idea and stresses components more than you'd think.

This is just my own hard won (and expensive) experience .
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