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Old Jan 13, 2008, 08:26 AM
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Joined Dec 2007
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Did i ruin my 5000m 22.2v?

i have been putting back about 3500-3800 after some very mild AP work on my Trex600. Flights are about 7-8 minutes. Yesterday, after an 8 minute flight, i put back 41??m. Is it reliable? Flight Power, 17 flights on it. How is the best way to test this battery and keep from ruining?
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Old Jan 13, 2008, 09:03 AM
Speed cost money.
highflier's Avatar
United States, FL, Marathon
Joined Dec 2002
3,045 Posts
What makes you think what you did was bad. reccommedation are to use about 80% of the capasity,
5000 * .80 = 4000 MAH

41?? MAH is close I wouldn not worry about it your pretty darn close, However you do not want to be putting 4500 MAH or more in.

Highflier
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Old Jan 13, 2008, 10:54 AM
Patrick Jenkins
USA, LA, 5
Joined Dec 2006
1,035 Posts
Don't worry. Factory actually specs the cells to 2.75V. They can usually handle a lot more abuse than what you have done to your pack.
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Old Jan 13, 2008, 11:05 AM
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Joined Dec 2007
19 Posts
thanks guys. this is only my second heli, first was cx2 blade. i ran that blade until it fell out of the sky, every day. i just don't want to 'drop' my heli & camera out of the sky. at 41??m, i don't think i'll go much more than the 8 minute mark. happy flying.
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Old Jan 13, 2008, 01:00 PM
Permanently Banned
San Jose Ca / RSA flyer
Joined May 2003
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Quote:
Originally Posted by safenate
i have been putting back about 3500-3800 after some very mild AP work on my Trex600. Flights are about 7-8 minutes. Yesterday, after an 8 minute flight, i put back 41??m. Is it reliable? Flight Power, 17 flights on it. How is the best way to test this battery and keep from ruining?
what's the SLOW discharge capacity ?

if 80%, YES, then its only good for salvage
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Old Jan 13, 2008, 02:22 PM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
8,511 Posts
Quote:
Originally Posted by safenate
i have been putting back about 3500-3800 after some very mild AP work on my Trex600. Flights are about 7-8 minutes. Yesterday, after an 8 minute flight, i put back 41??m. Is it reliable? Flight Power, 17 flights on it. How is the best way to test this battery and keep from ruining?
I've had a few flights where I took 96% of my FlightPower 6S2P 5000 packs (I say "packs" becuase it happened perhaps 5 times and I have multiple packs so it wasn't all on the same pack) with no ill side effects. Generally try and limit your discharge to 80% of pack capacity if you can but this single incident isn't going to kill your pack.

If you want to test it, do what others have suggested and charge it up full, then discharge it using your chargers discharge function and finally, charge it again and note how much goes in. Divide this number by the capacity of the pack and that's the percentage capacity that it will still hold. Example, after a complete discharge I put back in 4,840 in a 5,000 pack, meaning it still holds 96.8% capacity, no where near the 80% mark I should discard it after...

JFetter (Jack)
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Old Jan 13, 2008, 04:39 PM
Will fly for food
Maryland
Joined Sep 2004
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You don't want to do that often.

Basically you did some damage to the pack, but very little.

According to Kokam, keeping the discharge less than 80% of capacity increases the pack life "several fold."
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Old Jan 14, 2008, 09:09 AM
Registered User
Joined Dec 2007
19 Posts
hall woo: i'm not sure what you are talking about.

Thanks to all for the input. Amazing what these packs will take. i flew another 10 AUW yesterday for 8.5 minutes in moderate winds up to 200' and only put back 36??m. Same pack i flew 82% on the other day. This place is great...
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