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Old 11-22-2009, 04:02 AM   #1
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Default Swelling Lipo Cases

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Old 11-22-2009, 05:42 AM   #2
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Hi all..
Im a after a bit of advice regarding some of my lipos..I ran today and noticed that the single SMC 4900 40c 3.7v and an Intellect 5000 40c 7.2 volt cases have swollen a little?
Why is this and are they still ok/safe to use?
The swelling is noticable...Never over charged.
Rs-Pro single cell 3volt cut off..
RS-PRO 17.5...motors are runnig about 60deg C...
Ran both cars until they dumped..does this matter/damage/make the packs swell?
Any ideas?
Used my 10.5 LRP SPX Stock spec..same Intellect packs (not the same pack that swelled, another one) and no swelling? Same charger/same track/same day?
Mike
Some minor swelling is normal from what I hear. However, I would be very carefull with how you store any LiPo, especially those that noticeablly swell. Personally, I store all my LiPo batteries in an area of my garage that if they did go up in flames, they would not catch anything else on fire. I would advise storing them in LiPo sacks placed in a metal container. Just a side note, make sure your cells are balanced. An unbalanced pack is more suseptable to overcharging or overdischarging of one cell, causing swelling.
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Old 11-22-2009, 05:52 AM   #3
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if your temps were anything like sydney today 41c this may be the reason you have got some puffy cells

as they dont like been charged ov 35c

i would make sure that you keep an eye on them especilly if your going to try recharge them
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Old 11-22-2009, 05:57 AM   #4
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You said you ran them till they dumped, do you mean right till they wouldn't go or till you noticed they were getting slower? You may have gone below the min voltage. Charging them after may lead them to puff. I would be very careful with these packs now.
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Old 11-22-2009, 06:20 AM   #5
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I am not expert or all but as per what FOXY923 said, you maybe have gone below the min required voltage of a cell.

If you still running your car until the cutoffs goes on, there are possibilities that one of the cell will reach below its min voltage cutoff causing it to swell.

I run my packs only every 5 - 6mins even though it hasn't reach its cutoff or if I feel that my car is getting slow, I immediately stop playing and start resting the pack and charge after 10 - 20 mins.

Once in a while, you should also balance the batt.
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Old 11-22-2009, 06:39 AM   #6
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I think Mike is using one cells lipos so no need to balance but still see my above post.
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Old 11-22-2009, 02:15 PM   #7
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Default Swelling Lipos.

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Old 11-22-2009, 02:43 PM   #8
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I thought the cutoff was suppose to be 3.2? To me it sounds like you have gone below either way. With lipo you should only run until you notice a drop in performance. If you try to get these packs back be very careful. I would charge outside, well I would get rid of them. Are they still puffed up?
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Old 11-22-2009, 04:14 PM   #9
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Originally Posted by mikecatts View Post
Hi all..Thanks for the advice..
Wasnt hot yesterday...20 deg C.
I race 1/12 single cell and 1/10 tourer..my son does 1/12 and 1/10 tourer..
I have issues with both a single 3.7v and a 5000, 7.2v..
So, should i ditch them..or charge in the back shed under a fire blanket..Are they safe?
I always thought that the cutoff in the esc was to save the lipos..I had a cutoff of 3volt for the single cell...
The 7.2 volt...not to sure, an RS-PRO was used..i assume it has a pre-set lipo cuttoff?
I wont run till dumped again..When I say dumped..I mean the car wasnt going any more...
Maybee this killed them..
Thanks for the help guys.
Mike
Like said before if there puffy I would be real carefull!! I would pitch them in a safe manner because your asking for trouble and your gonna get it real soon. you asked for trouble when you ran it down to were you were losing power and Were you charging more then 1c??. If you chose to keep uning them I would keep them in a fire proof container and charger with a Lipo Sack
watch this then decide what you wana do http://www.youtube.com/watch?v=YCWdnjLqVWw
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Old 11-22-2009, 05:12 PM   #10
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If you are using I believe v198 or higher your tekin with 1 cell you have to turn on both the ESC and the booster/rx pack to enable the voltage cut off.
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Old 11-23-2009, 10:08 AM   #11
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Old 11-23-2009, 10:12 AM   #12
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I wont run till dumped again..When I say dumped..I mean the car wasnt going any more...
You should never run lipos that low. The moment they start to slow down at all, stop immediately.
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Old 11-23-2009, 10:23 AM   #13
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The 7.2 volt...not to sure, an RS-PRO was used..i assume it has a pre-set lipo cuttoff?
I wont run till dumped again..When I say dumped..I mean the car wasnt going any more...
Maybee this killed them..
"assume" nothing....and study up some on proper LiPO usage, charging, and care procedures.
It seems as if you're asking for trouble.
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Old 11-23-2009, 10:31 AM   #14
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Old 11-23-2009, 10:35 AM   #15
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