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Battery Sugestions?

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Old 02-10-2010, 10:13 PM
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Wizzard033
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Default Battery Sugestions?

I have a Multiplex Twin Star II that I have modified with 2 35mm x 30mm x 1250kv Rimfire motors and I want a 4000mah to 5000mah 3s battery thats capable of handleing a total of around 600 watts. What battery would you sugest and what price range would it be in?

Thanks for the help
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Old 02-10-2010, 10:45 PM
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Default RE: Battery Sugestions?

look at our 3S 5250 here: http://www.maxamps.com/Lipo-5250-111-Pack.htm
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Old 02-10-2010, 11:25 PM
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very nice!!!
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Old 02-11-2010, 12:00 AM
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Default RE: Battery Sugestions?

Also I've noticed that when it's colder the battery I am using is even less responsive. At take-off my current battery was 52deg today and I wasnt able to get many RPM without the voltage of the battery dumping.
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Old 02-11-2010, 12:05 AM
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Default RE: Battery Sugestions?

Li-po's drop capacity and at the same time C rate drops as well. You'll see this change start at 65 degrees and colder.

Reduce run times and how hard you run the packs.

Jason
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Old 02-11-2010, 12:09 AM
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Default RE: Battery Sugestions?

Thanx so much for all your help. I also noted that i was only able to draw about 30A at this temp. Is it best to keep my batterys at 'room temp' say 75 F until flight time. I fly at a freinds house so this wouldnt be a problem. Also I was considering covering the NACA scoop for the fuse ubntil the temps came back up. Also is the C rate a batteries ability to pass current or only as rating at which it can safely pass a given current?
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Old 02-11-2010, 12:21 AM
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Default RE: Battery Sugestions?

Yes you can start with a warm pack but more often the pack will cool to much during use. The C rate is just a rating and it's not a very well proven rating system at that. A 5000 20C pack if rated correctly should be able to support 100 amps constant with out pack damage but running a pack at that rate all the time will shorten it's life span. It's like running a NASCAR engine at high RPM's all day during a race. That engine is only good for that day then it's rebuild time. Always try to have more battery than what is needed. A little cushion is always best.


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Old 02-11-2010, 12:24 AM
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Thanx for the help I think i'm on the right track and getting a good handle on elctric aircraft.
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