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UltraMicro Battery Problem - 1/3/2013 12:38 AM   
Gypsy56


 

Posts: 143
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Joined: 1/20/2006
Last Login: 5/19/2013
From: greenbrier, TN, USA
Status: offline 		Although I have been flying R/C for many years, I just got into UMs last spring. Over the last several months I have collected a Champ, T-28, Night Vapor and a kit built UM. I have nine 1s batteries ranging from 70ma to 160ma. Five of the nine batteries are now bad after only a few months. I've always been told to store LiPos at 50-60% charge and that's what I always do. Are these batteries just naturally short lived? I noticed that the instructions with one of my UMs said to fully charge the battery after flying. Should I be storing them fully charged? I charge them with the factory supplied charger powered by 4 AA batteries. One of the batteries was puffed, the other four are very low power. after a full charge, they will only run 15 or 20 seconds before they slow down and hit low voltage cutoff.
Any ideas?

Thanks
Ed

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RE: UltraMicro Battery Problem - 1/6/2013 8:16 PM   
nitrofevr


 

Posts: 106
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Joined: 11/4/2007
Last Login: 5/3/2013
From: Aztec, NM, USA
Status: offline 		How many cycles on the batteries?

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RE: UltraMicro Battery Problem - 1/6/2013 8:31 PM   
Gypsy56


 

Posts: 143
Score: 100
Joined: 1/20/2006
Last Login: 5/19/2013
From: greenbrier, TN, USA
Status: offline 		Thanks for the answer, I was beginning to feel like the last kid picked for the ball team!
I would guess three to five cycles on each one. I don't get to fly my UMs very often because of normally high winds in this area.

Ed

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RE: UltraMicro Battery Problem - 1/6/2013 9:35 PM   
nitrofevr


 

Posts: 106
Score: 105
Joined: 11/4/2007
Last Login: 5/3/2013
From: Aztec, NM, USA
Status: offline 		What brand? Have you stored them in really cold temps?

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RE: UltraMicro Battery Problem - 1/6/2013 10:18 PM   
Gypsy56


 

Posts: 143
Score: 100
Joined: 1/20/2006
Last Login: 5/19/2013
From: greenbrier, TN, USA
Status: offline 		Here are the five batteries that went bad:
HobbyZone 150ma
G-Force 130ma
E-Flite 120ma
ParkZone 70ma
G-Force 160ma
They were all stored at room temp in insulated ammo cans.
All were 6-8 months old, bought new and stored at half charge.

Does anyone store their 1 cell LiPos at full charge?
This is a mystery to me.

Ed

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RE: UltraMicro Battery Problem - 1/6/2013 10:22 PM   
nitrofevr


 

Posts: 106
Score: 105
Joined: 11/4/2007
Last Login: 5/3/2013
From: Aztec, NM, USA
Status: offline 		I abuse all of my lipos. I rarely balance and never put in a storage charge. Are your planes modded at all?

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RE: UltraMicro Battery Problem - 1/7/2013 12:04 AM   
Gypsy56


 

Posts: 143
Score: 100
Joined: 1/20/2006
Last Login: 5/19/2013
From: greenbrier, TN, USA
Status: offline 		No mods, a Champ, T-28 and Night Vapor, all factory stock.
Also a Stevens Aero Quick Oats with Champ guts.
I can charge the bad batteries on OEM chargers and test them when they come off. They will show from 4.17 to 4.19 volts.
After just a few seconds, you can hear the motor slow and then it shuts down. It will run again after re-arm, but only for 3 or 4 seconds. These batts do this with all my UMs, the other four batteries work fine.
I can't help but think I'm doing something wrong, but I don't know what it would be.
Too much of a coincidence.

Ed

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RE: UltraMicro Battery Problem - 1/8/2013 6:55 AM   
keithhs


 

Posts: 42
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Joined: 2/18/2007
Last Login: 5/4/2013
From: Cherokee, KS, USA
Status: offline 		Pretty typical of the luck that I have with batteries.

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RE: UltraMicro Battery Problem - 3/7/2013 2:09 PM   
TRAXXAS6606


 

Posts: 16
Score: 100
Joined: 3/5/2013
Last Login: 5/13/2013
From: Fredericksburg , VA, USA
Status: offline 		I've had the same problem. I think mine are shot now. 

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