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Old Nov 05, 2008, 08:30 PM
Registered User
orlando florida
Joined Jun 2005
191 Posts
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Battery Help

I need a little help on Li Po's

I'm building an A-10 15-18lbs Flying weight including batteries, I will be using 2 hoaye 4.5" fans with 2 KB45-17XL capable of handling 36v and using 2 Hobby Wing 100a HV ESC. I Plan on using 8s to each motor 16s total. My question is this I have come accross some LiPo's with different discharge rates and capacity. I need help on what do you guys think would be the best way to go with my setup. Here are my choices:

14.8v 3300mah 25c
14.8v 3700mah 22c
14.8v 2200mah 25c

2 of these batt. to each motor would give me some serious mah & volts but would it be safe to do the higher mah setup, which is only a $10 more than the 3300 mah setup for a set of 4 or should I play it safe and stick with the 3300 or 2200mah batteries. I'm leaning toward the 3700mah to get good flight times without coming even close to low discharging. Any and all help will be greatly appreciated.
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Old Nov 05, 2008, 08:50 PM
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Canada, NS, Truro
Joined Aug 2004
293 Posts
Between the 3700's and the 3300's there's only a fraction different in the max contiuous current, 1.something amps. The 3700's should hold their voltage a bit longer if they are true 3700. They will be slightly heavier so it's swings and roundabouts. What is your WOT (max) current? I shouldn't think the 2200's will handle it anyway.
Cheers,
Charles.
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Old Nov 06, 2008, 02:27 AM
A-4 nut!!
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Vancouver B.C.
Joined Apr 2002
4,654 Posts
I don't think any of them will be enough.....anything more than 65 amps will kill the batteries.
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Old Nov 06, 2008, 05:56 AM
Registered User
orlando florida
Joined Jun 2005
191 Posts
What woould you recommend for batteries? These fans & motor combo are putting out about 6lbs of thrust on 8S, for my plane that would be times 2. Would that be enough thrust for the size plane, I want a nice flying Jet not a Sky rocket. Please let me know.
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Old Nov 06, 2008, 09:57 AM
Effumall
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Joined Nov 2005
3,619 Posts
What amps are you drawing? There's no way to answer definitively unless we know what you'll be asking the batteries to do. One thing is sure: If a pack claims 25C, only use it for 18-20C if you want it to last more than a few flights.

If I were doing this project, I'd be using 100A packs at a minimum, (and calculating the 100 amps based on 18-20C. (Like 5000 mah rated for 25C)
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