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A123, effects of cold temps? - 3/20/2009 2:24 PM   
StikDude


 

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From: Lawrenceburg, IN, USA
Status: offline 		Just curious if cold temperatures 32F or below will degrade the A123 voltage/amps over time? A lot of times (like today), I pack everything in my car to fly after work. I typically bring my TX inside to work with me, but the Rx would be a pain in the butt to remove each time. I ask the question because I difinately saw an negative effect on Nicd (reduced number of flights when cold vs. warm out) when flying 72mhz systems.


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RE: A123, effects of cold temps? - 3/22/2009 3:16 AM   
Mr. Mugen



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From: Bottom feeder feeder #1 pooper, MI, USA
Status: offline 		Waiting to hear what is good and bad here. I just took my planes in from cold storage and found that I left 2 of my A123 packs plugged in. They were both switched off but one of them is at 2 volts. It will not take a charge and only has about 10 cycles on it. Is it trash? If so is it possible the cold temps did it? I cannot see how it would have drained with a switch being closed. I checked the other side of the switch with a good battery installed and found no voltage what so ever on the other side.

Kevin

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RE: A123, effects of cold temps? - 3/22/2009 11:53 AM   
bob_nj


 

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RE: A123, effects of cold temps? - 3/26/2009 2:14 PM   
StikDude


 

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Status: offline 		Anyone got an answer?


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RE: A123, effects of cold temps? - 3/26/2009 3:49 PM   
snellemin



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Status: offline 		I just run my packs in the cold. Once they warm up, they are fine. But in my amp sipping setups, I just warm the packs up a bit before running them for max performance. I use 1mm thick heatshrink on all my cells to keep them "warmer" for max performance and also helps in the cold weather.

2V is what I set my A123 cutoff at. If my cells do go below this voltage, my FMA/Balancepro charger does it magic and bring them back up from the dead. It charges them at 5mah I believe, until the cell voltage comes back up and then dumps the full 10amps into them.
I do bring them down quite often and have no problems with them. I even charge my 6s1p pack in lipo mode(4.2V) and the pack still takes 2500mah. My older packs take in 2200mah, but they still put out all the amps I need.

In the first pic you can see that I my voltage in higher at the 164amp load. The second pic shows the voltage being quite lower when the pack pack was "cold".
btw the temps in the snapshots are recorded of the ESC.





< Message edited by snellemin -- 3/26/2009 9:41 PM >

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