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02-08-2010 12:29 AM  8 years agoPost 21
tryan02

rrProfessor

Canton, Missouri

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Auto deleted by lipo police!

No Really I am the club President!!!

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02-08-2010 12:37 AM  8 years agoPost 22
Ace Dude

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USA

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Perhaps you could simply provide us with some factual data (i.e., non-personal opinion) to show that storage at 50% has impact on performance or life span?
I never said it does. I said it's what most manufacturers (e.g., Hyperion) recommend. You said it doesn't matter. Now, if it doesn't matter then you must have some factual data. So you can either man-up and support your claims with data or you can't.

  

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02-08-2010 12:41 AM  8 years agoPost 23
tryan02

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Canton, Missouri

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Auto deleted by lipo police!

No Really I am the club President!!!

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02-08-2010 12:44 AM  8 years agoPost 24
Gregor99

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Western Wa

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Reciprical auto deletion.

Revolectrix Beta Team

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02-08-2010 12:51 AM  8 years agoPost 25
Ace Dude

rrProfessor

USA

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You know I cant provide data for it as you cant provide data against it.
Perhaps you can call Charlie Wang at TP tomorrow and tell him he's all wrong.

http://thunderpowerrc.com/documents/Winter.pdf

"Winter’s Coming Please Read This:

If you need to store your batteries for the winter, we would
like to help you make sure they are fresh and flight ready
for spring. Li-Poly batteries do not handle being left in the
fully charged or drained condition very well. To insure you
have good batteries for spring please follow these basic
steps:

1. Charge the battery for storage to 3.8v to 3.9v per cell.

2. Check the voltage with a Digital Volt Meter once a
month while they are in storage.

3. Re-charge them as necessary to keep them at 3.8v to
3.9v per cell.

4. Keep them stored in a cool, dry area with a stable
temperature of 40 to 70 degrees F.
We hope this will make it easy for you to jump right out
and resume flying when spring comes."

  

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02-08-2010 01:03 AM  8 years agoPost 26
tryan02

rrProfessor

Canton, Missouri

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I am humbled I was completely wrong.

Now that I know Charlie Wang says we should use a storage charge on our lipo's.

No Really I am the club President!!!

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02-08-2010 01:07 AM  8 years agoPost 27
Heli_KV

rrKey Veteran

Ottawa, Canada

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Ok. Great. So what the method of discharging? I guess that's device we (at least me) are missing. For those, who do not have charger with discharge function.

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02-08-2010 01:09 AM  8 years agoPost 28
Gregor99

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Western Wa

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Dave from Hyperion

As I noted before, my 8 years of selling lipo and supporting Lipo users is data (one hell of a lot of data). That data says that storing for loing periods without use kills batteries on "average". A particular pack, particular environment, or the particulars of usage may lead to bad results, or not, depending on those particulars.

It's data, take it or leave it. IMO, it's better to err on side of caution, given the known history.

http://www.rcgroups.com/forums/show...7&postcount=601

More from another long time lipo user and tester

http://www.rcgroups.com/forums/show...9&postcount=598

Two vendors who know absolutely nothing about LiPolys.

http://www.rcgroups.com/forums/showp...4&postcount=52
Snip:

Quote:
My experience as one of the earliest and longest suppliers of LiPo to R/C has indicated - for previous batteries - that STORE mode is absolutely necessary whenever the store period will exceed more than a few days.

This is based on a HUGE frequency of claims like: "Hey, I only used my batteries a few times, charged them, and the next year (or 6 months later, etc...) they were puffed up (or weak, or low cap, etc)." Versus the same battery series and batch having performed well for several years when used more regularly and/or stored 1/2 cap while not in use.

http://www.rcgroups.com/forums/showp...&postcount=148

Snip:

Quote:
3)we recomment 3.8V (50% charge for 2 to 3 years storage)
3.5V allows 9 to 18 month storage (18 months at optimium condition)
3.3V allows 6 to 12 month storage (12 months at optimium condition)
3.0V bad idea

Strange that those who sell massive quanities of LiPolys and have for years know so little.

I have preached storage at 3.85 per cell for years and now most decent LiPoly chargers have such a storage charge to and discharge to function built in.

At least if I am wrong which my 3 year storage results clearly shows I am right then I am in good company.

One more time ,improper stotage increase the IR of the cells. If you are using the LiPOlys at low C rates it does not matter. If you are using them at close to their mac. C ratings it matters a great deal.

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02-08-2010 01:15 AM  8 years agoPost 29
tryan02

rrProfessor

Canton, Missouri

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I see the error of my ways now 6mo-1year? I wouldnt dream of letting a lipo sit that long I would have to take it flying. 1 month would be the longest any of my packs have sat.

No Really I am the club President!!!

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02-08-2010 01:24 AM  8 years agoPost 30
tryan02

rrProfessor

Canton, Missouri

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But hey HeliKV for your original question. It isnt regulated although I could remedy that situation I do have a Esky lipo discharger but it takes a lot of time on the SIM.

No Really I am the club President!!!

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02-08-2010 01:43 AM  8 years agoPost 31
Heli_KV

rrKey Veteran

Ottawa, Canada

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I see, tryan, why you do not like to discharge. You should be very good SIM pilot then.

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02-08-2010 02:00 AM  8 years agoPost 32
Gregor99

rrElite Veteran

Western Wa

My Posts: All  Forum  Topic

Here's another thing to consider. Most of use discharge our packs to about 3.6v to 3.75v per cell in a flight. If you follow the advice in the table above, there's no need to charge them to 3.85v. They'll be fine for months at 3.6v. Not charging them at then end of each session is actually easier then charging them to 100% so they can sit for week.

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02-08-2010 02:08 AM  8 years agoPost 33
tryan02

rrProfessor

Canton, Missouri

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I see, tryan, why you do not like to discharge. You should be very good SIM pilot then.
I dont have much use for a sim that lipo has been in there for months. I have 2 lipos over a year old and flown so much that they lasted longer than the balance tabs. The wires keep breaking off. Not bad considering they were abused never being storage charged.

They are original packs from when fender first become a PPRC rep.

No Really I am the club President!!!

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