Lipo puffed when not used in storage?

[SweetZ28]

I used this lipo one time and store charged it last year and now went to go use it and it's puffed like a water bottle!
the voltage reading is 3.8V so i think one cell totally gone bad and now the second one got puffed also from the first one going bad.
The thing was brand new ran one time nothing was wrong with it when i stored it?
Guy's say lipos last so long and you get hundreds of charges out of them I don't know all the lipos i have i tell ya the truth the good old NIMH packs seemed to last and be much more usful in the long run.
How could this puff up when it was new? i once had another lipo do the same from sitting in storage do they have to always be charged and draind frequantly to stay in good shape and last long because to me if feels like if you don't use them often they may go bad?

ALSO how should i dispose of it ... disharge it all the way to Zero Volts? what amprage should i use?

Thanks any help will be great.

[99z286spd]

You can put it in a bucket of "salt" water to neutralize the pack. it will take 24-48 hours. and then check voltage and should be zero. then you can throw it out. as far as the pack puffing......im not sure. ive stored mine before for 8 months or so but they were perfect.
maybe where you stored them it got to hot???..... hope this helps ya.

BTW I like your user id

[forescott]

How often should you check your packs after you "store" them? They will slowly discharge over time. But how fast??

[Fluid]

I've stored my ThunderPower 5S2P packs for up to seven months between uses and they as as strong today as when new - at least they propel the boat as fast. I store at 3.85 volts per cell in a 72F environment, and after seven months the voltage was 3.8 volts per cell. These packs are three+ years old, I have others which are older and they store just fine too. I don't buy cheap Chinese packs so I don't know what happens with these over time.

LiPo packs should be stored between 3.8 and 3.9 volts per cell in a mild environment. They can puff from being over-discharged, over-charged, or over-heated in the past. The "newness" of cells is not much of a factor depending on how they were cared for.



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[forescott]

Unfortunately my budget doesnt allow me to spend hundreds of dollars for expensive lipos. So I'll have to make due with my cheap chinese lipos. Which have worked well for me so far. I guess I'll check em every couple of months or so to be safe.

[SweetZ28]

Thanks guy's i used my ICE charger and discharged the pack to .1v cell and then hooked my light bulb discharger on it for like 10min and the battery had no Volts left in it at all.

Maybe i should store them in a different area as they are stored in a sun porch in the winter i would say 50's and summer can get 90? who knows maybe a lot of temp fluctuation can do this?

THANKS

[Fluid]

Several battery suppliers recommend storing between 40F and 70F.

[SweetZ28]

Several battery suppliers recommend storing between 40F and 70F.

Guess i will have to store in another place!
THANKS.

[crabstick]

Recently learn't this lesson the hard way.

stored some lipos charged (DURRRR), in a box, in my warm server room for about a year... balance was out of whack before charging and when I used it, once cell puffed so hard it ruptured the satchel.
Another brand new pack that I had stored charged (DURRRRR) was puffed

I charged these cells intending to use them but for whatever reason put them away at full charge (DURRRRR)

Trying to think of a decent reasonably cold place to keep them..

From what I have been reading there are a couple important things to storing lipos
1. Storage charge them
2. discharge and charge at 6 months
3. Keep them in a cool area, not a server room thats about 28degrees celcius

[SweetZ28]

I have all my lipos charged in storage mode so i guess it's the heat and cold tems fluctuating to much that may have caused the lipo to go bad... then again i am starting to think storiung them at 3.8v per cell may be to high and causing the damage to the cells..... why could't you store at 3.5 or 3.6v per cell theu won't drop belloow 3V per cell and less energy being stored would be a good think i think.....reason why they say don't leave lipos go for a long time when fully charged?

[Visual Perfection]

That is puffed? I have two packs I have been using that look almost like that...(2 rhino packs) bought them from a member on here and they showed up that way, didnt think anything of it being they look like they should be like that.

How do I know what they SHOULD look / feel like? They work just fine.

[sailr]

That's not much of a puff. I have seen just the heat shrink puff up that much after a hot run. I have CAREFULLY poked a couple of hole in JUST THE HEAT SHRINK, not the cell and they come right down. The shrink is so tight on some packs that once it swells up it can't go back down.

[SweetZ28]

That is puffed? I have two packs I have been using that look almost like that...(2 rhino packs) bought them from a member on here and they showed up that way, didnt think anything of it being they look like they should be like that.

How do I know what they SHOULD look / feel like? They work just fine.

If you push on the pack with your finger and it is soft or feels like it's filled with air like a bike tube it is shot... they should be hard.... you should never use a blown up swollen lipo it's just ready for disaster!

[Fluid]

.... why could't you store at 3.5 or 3.6v per cell theu won't drop belloow 3V per cell and less energy being stored would be a good think i think.....

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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[Visual Perfection]

I think like sailr said, the heat shrink is so tight it can cause air to be trapped in them, and I think that is how mine are. They do feel like there is a little air in them... I hope I didnt get screwed on these

Maybe I should try putting a small pin hole to let the air out also, don't see how it would hurt?