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Lipo charge concern / Use recommendations?

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Old 10-31-2011, 11:54 AM
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cd3217
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Default Lipo charge concern / Use recommendations?

Would welcome any input from anyone who's had experience with this type issue:

Facts:

Bought 6 Blue Lipo 5000 20C packs last March.
All stored last 4 months in refrigerator until airplane completion.
Batteries wired up for 10cell operation in 2 meter pattern application.

First charge attempts:
Charged 2 of the 10s packs with no problems. (Cellpro 10S on Iota 55). Last pack had .1v consistent lower voltage on cell #7 and required 4 disconnects & restarts to complete charge…charger would show consistently lower fuel state and I would reboot. (26% 58%, 76%, 89% to completion). Voltage unknown at start of 1st attempt but showed 26% fuel at start…. At end of attempts I’m seeing the following on pack 3:

Fuel 100%
42.025 pack voltage
4.202v on all cells so I’m assuming it balanced.
No reading on any of IR’s on any of the cells. (Maybe because last reboot only put in 179ma???)

What would be your recommendations considering that I’ve got a $43 battery pack investment which is causing the concern.

Thanks, Chris
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Old 10-31-2011, 12:08 PM
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J Lachowski
 
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Default RE: Lipo charge concern / Use recommendations?

Discharge slowly to storage charge and then charge again at a slower rate and see what happens? Just a swag.

I had a similar thing with a new GensACE 5S 5300 and just charged and discharged several times and then flew it. After a dozen flights it's better and basically takes a little more time to balance charge than the other one I have.

FYI, I have two sets of those packs which I have put away for the winter. Both sets have 45 flights on them. No swelling etc. knock on wood yet. I used them as practice packs through the summer. They are pretty good, but just a tad weaker than my Thunderpower 5000 25C G6's.
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Old 10-31-2011, 12:18 PM
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cd3217
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Default RE: Lipo charge concern / Use recommendations?

Thanks Joe!
Chris
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Old 10-31-2011, 12:28 PM
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Default RE: Lipo charge concern / Use recommendations?

Chris, Joe has it right.  You have to bring the batteries back up just like you do when you break them in.  The Cellpro 10S is not the best at calculating % displayed...mainly keep track of your mah.  Additionally, you won't see any IR if the starting point of the charge is above 80% as it was on your last reboot attempt.

Scott
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Old 10-31-2011, 12:31 PM
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cd3217
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Default RE: Lipo charge concern / Use recommendations?

Thanks Scott....
Chris
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Old 10-31-2011, 03:59 PM
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Default RE: Lipo charge concern / Use recommendations?

Storage = Don’t forget to store them at 3.7 to 3.8v per cell and check it every once in a while.

>>

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Old 10-31-2011, 07:09 PM
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Default RE: Lipo charge concern / Use recommendations?

Keep an eye on cell #7. I had the same situation with a different name brand of 5cell pack. A particular cell did not take charge and eventually went dead. I could return the pack immediately after noticing the condition.
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Old 11-01-2011, 03:53 AM
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Default RE: Lipo charge concern / Use recommendations?

Thanks guys....will do.
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