Lipo puffed when not used in storage?

[Visual Perfection]

Well I sent a PM to the member I bought them from..not sure what to do now.

Havent even charged them or anything yet, just ran them a few minutes to get them to the recommended storage voltage for now and they sit until I get a charger..but they arrived that way and not knowing anything about lipos my stupid self didnt think anything of it

Oh and sorry for the thread hijack...just fits my situation as well it seems like and hoping for some help

[SweetZ28]

Well I sent a PM to the member I bought them from..not sure what to do now.

Havent even charged them or anything yet, just ran them a few minutes to get them to the recommended storage voltage for now and they sit until I get a charger..but they arrived that way and not knowing anything about lipos my stupid self didnt think anything of it

If there not flat and round shaped and feel like air is in them they are toasted.
who sold you these?
I woulds send them back and get your $$ back also.

[Visual Perfection]

I dont want to put any blame on anyone, as I don't know how they were before they left..he said only a few runs on them.

Is there any way they could have puffed during shipping? He sent them charged and balanced for me.

[Visual Perfection]

where should I store them? I am scared now lol

EDIT..original owner said they have always been like that, and if they werent safe he wouldnt have sold them. He gave me the option to ship them back to him if I feel they are unsafe, but I think I might keep them as they prob. are just fine.. I am happy he gave me the option.. good seller

[SweetZ28]

This is the last time i will tell you this ... Maybe some other member will tell you also.....if in any way they are soft or air filled and look kind of like the one i show in my photo they are no good.
Do what you want with them but if it was me i would send them back and get my $ back there shot if they show any symptoms i speak of.

[SweetAccord]

So once a Lipo is charged, and say they are not run for the day, how long may they sit at their fully charged state?

[nomobux]

So once a Lipo is charged, and say they are not run for the day, how long may they sit at their fully charged state?

I think if you ask 10 guys, you'll get 10 answers My thread is "Puffed Lipo " I stopped at the airport with my lipo and talked to about a dozen guys flying electric. They have been electric for years. Not one uses the storage mode. Not one, and never a problem. I'm getting real confused on all this.

[Fluid]

Asking ten randon peple what they do for LiPo storage is bound to get you ten different answers. Ask the same folks the best brand of LiPo, or the best motor, or what kind of woman they alike and you'll get different answers too. Don't waste your time looking for concensus, you won't find it.

If you want to know the "right" way to store LiPos follow the manufacturer's instructions. Otherwise do whatever you want to do. Most hobbiests (air, land or water) don't know much about the technical end of the hobby anyway....



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[Insaniac]

Every LiPo I have ever purchased new has arrived at about 30% from the manufacturer. My Thunderpower charger has a 50% "storage" charge, so I would say anywhere between 30 and 50% for storage at room temperature.
I NEVER leave them stored at 95% or below 30% and never have had any problems.
FWIW...

[FighterCat57]

I don't have the answer, but all LiPo distributors say store at 1/2 charge - which is around 3.8 volts per cell. I've had great luck following their instructions (RTFM) so I will let others try to second-guess the battery experts.



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3.8v/cell is exactly where the "storage mode" on my charger leaves them and exactly (within .05v) where they come new.

Asking ten randon peple what they do for LiPo storage is bound to get you ten different answers. Ask the same folks the best brand of LiPo, or the best motor, or what kind of woman they alike and you'll get different answers too. Don't waste your time looking for concensus, you won't find it.

If you want to know the "right" way to store LiPos follow the manufacturer's instructions. Otherwise do whatever you want to do. Most hobbiests (air, land or water) don't know much about the technical end of the hobby anyway....



.

Yeah, it's kinda like going to the DMV for automotive care advise.

[Alfa Spirit]

Your LiPo is normal,

Here' s a puffed pack

[SweetAccord]

So what is the answer then? I'm not asking on storing as that is clear what to do everywhere there is Lipo information. What I'm interested in and what I don't find info on is if you fully charge a Lipo but do not run it for whatever reason, how long may it sit before you should put it on the charger and put it in the storage mode? I find some say a week or two is fine. But what is the true time or does that depend on mAh ratings?

Peace.

[FighterCat57]

So what is the answer then? I'm not asking on storing as that is clear what to do everywhere there is Lipo information. What I'm interested in and what I don't find info on is if you fully charge a Lipo but do not run it for whatever reason, how long may it sit before you should put it on the charger and put it in the storage mode? I find some say a week or two is fine. But what is the true time or does that depend on mAh ratings?

Peace.

Since it is a chemical reaction which causes degradation over time, I would say cumulatively... minimize overall time spent at high/low voltage. I wouldn't think there to be any "safe" amount of time as the cumulative time spent under or over is what leads to total loss of use.

HTH

[Jason MaxAmps.com]

Guys what happens if stored full the IR or internal resistance increases. This increase in IR then makes it very hard for the pack to support a high current load. This equals puffed pack either the first time you used it after it has sat for a long period or if it has sat long enough without use. And yes they will over time drop voltage as well but it takes longer than say a NimH pack. To help fight this issue store packs at 60% of their rated capacity if they are going to sit for a week or more. Lets face it we don't always know when the next run will be. DO NOT store by voltage, that is incorrect. DO take the pack if it has been sitting in store mode and cycle it once every 30 days. Top the pack off, discharge, then put back to store mode again. You are basically conditioning the pack and stopping the IR build up. In general from testing done packs that are stored improperly will have a much shorter life span say anywhere from 6 months to a year rather than 2 to 3 yrs of ones that are stored properly. IR increase issues tends to be more of a problem with higher C rated cells. back in the days of 10 to 20C stuff it wasn't as big of an issue.

Jason

[sailr]

Not sure I follow. You say store at 60% but not by voltage? If you discharge it, doesn't the voltage drop? Are you say to discharge, for exampel, a 4000mAh pack to 2000mAh?