Go Back  R/C Tech Forums > General Forums > Electric On-Road
What i did wrong ? (3 batteries to trash can) >

What i did wrong ? (3 batteries to trash can)

What i did wrong ? (3 batteries to trash can)

Old 01-13-2011, 02:13 PM
  #1  
Tech Elite
Thread Starter
iTrader: (1)
 
Tabushi's Avatar
 
Join Date: Feb 2003
Location: Chile - Southamerica
Posts: 3,029
Trader Rating: 1 (100%+)
Default What i did wrong ? (3 batteries to trash can)

Hi guys,

Didnt raced for the last 4 months, now im preparing my cars for the season and took my 3 racing lipo packs (7.4v hardcase roar approved) wich were without usage during 4 months, 2 of them stored on STORAGE mode of charge and the other one 3/4 charged.

The thing is that i put the 3 batts on 3 different chargers at the same time (each one 5.200mah pack, 40c) on balance-charge mode at 2.5amp.

The 3 batts finished the charge no problem,i disconnected them and thats it. Next day morning 3 of them were inflated like triple hamburguers !!! ... they even broke the hardcase off !! ...

So, WHY IN THE HELL this happened ?, im mainly a nitro racer so i can accept that i did something wrong, but i still dont see that really,

Now i have to buy new batts.

I use 11.1v lipo pack on my radio and 14.v pack on my starter box for nitro cars now im afraid to try to charge them too !!

thanks for your time guys,
Tabushi is offline  
Old 01-13-2011, 03:35 PM
  #2  
Tech Addict
iTrader: (6)
 
tunerjetta29's Avatar
 
Join Date: Oct 2004
Location: Fontana,CA
Posts: 691
Trader Rating: 6 (100%+)
Default

Left them over night? Your chargers have an automatic cut off and designed for lipos? Sounds like they overcharged severely and your lucky you still have a house.
tunerjetta29 is offline  
Old 01-13-2011, 03:41 PM
  #3  
Tech Champion
iTrader: (14)
 
skypilot's Avatar
 
Join Date: Mar 2007
Posts: 9,662
Trader Rating: 14 (100%+)
Default

Originally Posted by tunerjetta29
Left them over night? Your chargers have an automatic cut off and designed for lipos? Sounds like they overcharged severely and your lucky you still have a house.
thats not what he said..
skypilot is offline  
Old 01-13-2011, 03:49 PM
  #4  
Tech Fanatic
iTrader: (37)
 
BCbud's Avatar
 
Join Date: Sep 2009
Location: Victoria BC Canada
Posts: 763
Trader Rating: 37 (100%+)
Default

Good day!

What make of batteries? What make of chargers and are they all the same? Where the ballance cables conected all the way? Did both cells puff or just one?

I may not be able to answer your question but this info will help others help you.
BCbud is offline  
Old 01-13-2011, 03:49 PM
  #5  
Tech Apprentice
iTrader: (2)
 
scottmen's Avatar
 
Join Date: Oct 2010
Location: SoCal
Posts: 55
Trader Rating: 2 (100%+)
Default

I read that you are supposed to pull them out once a month to make sure they are still at the storage voltage. They discharge even when not connected.

This was one of the most informative sites I read about LiPos

rchelicopterfun.com/rc-lipo-batteries.html
scottmen is offline  
Old 01-13-2011, 04:29 PM
  #6  
Tech Addict
iTrader: (6)
 
tunerjetta29's Avatar
 
Join Date: Oct 2004
Location: Fontana,CA
Posts: 691
Trader Rating: 6 (100%+)
Default

Originally Posted by skypilot
thats not what he said..
Yep, must have skimmed the disconnected part.
tunerjetta29 is offline  
Old 01-13-2011, 04:31 PM
  #7  
Tech Elite
Thread Starter
iTrader: (1)
 
Tabushi's Avatar
 
Join Date: Feb 2003
Location: Chile - Southamerica
Posts: 3,029
Trader Rating: 1 (100%+)
Default

Yes, they were charged, and unplugged from chargers and they were puffed next morning.

3 charges, 2 of same brand one different, respectable brands (dont want to go into that hehehe) ... i charged couple of batts from a friend last week no problems at all (all were in-use batteries) ...

Batts were IP 5200's ...
Tabushi is offline  
Old 01-13-2011, 05:03 PM
  #8  
Tech Adept
 
clittle's Avatar
 
Join Date: Mar 2008
Posts: 138
Default

Were they subject to a fairly significant temperature change during the evening?
clittle is offline  
Old 01-13-2011, 06:55 PM
  #9  
Suspended
iTrader: (14)
 
Join Date: Jan 2010
Location: I'm banned
Posts: 141
Trader Rating: 14 (100%+)
Default

hamburger'd

pics?
ballsagna is offline  
Old 01-14-2011, 05:22 AM
  #10  
Tech Champion
iTrader: (1)
 
Join Date: Feb 2003
Location: Sydney, Australia
Posts: 5,310
Trader Rating: 1 (100%+)
Default

You shouldn't leave lipos fully.charged. Everyone who comes from the.old.nimh days remebers.how.nimh batts where.pushed to the point where packs were only.good.for.a.single.meet. Lipo is going the same way with racers asking for higher and.higher c ratings (like it makes any difference) and packs are once again heading towards being more and.more volatile. If you want to prep a pack for racing try around 80-90% charge and quickly top it up at the track. Keep it at this.level.for the minimum time.possible.

At the end of the day it is safer to turn up to the track and charge at 2C than bring you packs precharged from the.day/night before.
Dragonfire is offline  
Old 01-14-2011, 05:27 AM
  #11  
R/C Tech Elite Member
iTrader: (315)
 
nexxus's Avatar
 
Join Date: Dec 2005
Location: Perth, Australia
Posts: 8,947
Trader Rating: 315 (100%+)
Default

I don't necessarily agree with that, part of the initial sales pitch of Lipo was that we can charge them and not have to run them for up to a week, any storage beyond a week was when you put them into storage mode.

My understanding was that the higher C rated Intellect packs did tend to puff a bit.
nexxus is offline  
Old 01-14-2011, 07:13 AM
  #12  
Tech Champion
iTrader: (1)
 
Join Date: Feb 2003
Location: Sydney, Australia
Posts: 5,310
Trader Rating: 1 (100%+)
Default

Originally Posted by nexxus
I don't necessarily agree with that, part of the initial sales pitch of Lipo was that we can charge them and not have to run them for up to a week, any storage beyond a week was when you put them into storage mode.

My understanding was that the higher C rated Intellect packs did tend to puff a bit.
Intellect packs always have some.problem... It seems to be their moto. The.chemistry of.lipo's is changing to give more and more.power, but like nimh's there has to be a downside. Lipos are already like nimh's in the way that you need to treat them properly or you will kill your packs. 6 Months from now we will probably be buying a "lipo nurse" for storage between meets....
Dragonfire is offline  
Old 01-14-2011, 04:51 PM
  #13  
Tech Elite
iTrader: (3)
 
Join Date: Jun 2003
Posts: 4,593
Trader Rating: 3 (100%+)
Default

I have cheap 5200/50c lipos that I sometimes leave fully charged for over a week. Abused weekly and never balanced. None of them have bloated.

Probably a product defect if a lipo bloats by simply being fully charged for 24 hours?
rccartips is offline  
Old 01-14-2011, 06:12 PM
  #14  
Tech Champion
iTrader: (34)
 
RedBullFiXX's Avatar
 
Join Date: Mar 2003
Location: Intergalactic Planetary
Posts: 6,542
Trader Rating: 34 (100%+)
Default

Some Model Car battries puff more than others
RedBullFiXX is offline  
Old 01-14-2011, 06:22 PM
  #15  
Tech Elite
iTrader: (64)
 
SpraydbySprague's Avatar
 
Join Date: Jun 2008
Location: Conducting aggressive board meetings at my local track
Posts: 3,301
Trader Rating: 64 (100%+)
Default

Originally Posted by RedBullFiXX
Some Model Car battries puff more than others
SpraydbySprague is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.