wickedgeezer Posted October 15, 2011 Share Posted October 15, 2011 is it normal for a lipo hardcase to balloon, it was very hot and after about ten mins it settled flat, that was about a hour ago i will be charging it soon Quote Link to comment Share on other sites More sharing options...
cupramat Posted October 15, 2011 Share Posted October 15, 2011 i wouldnt charge it again if i was u, i wouldnt want it near me mate. i had one do it to me the other day n i looked on here n most people say the battery has come to the end of its life. Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 i thought it was cos it got drained to quick, its on a 120esc with a castle 6700kv in a bullet Quote Link to comment Share on other sites More sharing options...
Revorocks Posted October 15, 2011 Share Posted October 15, 2011 What capacity and C rating was the battery? If they are discharged too quick they will get very hot and swell up, hopefully you haven't done too much damage and the swelling will go down a bit as it cools... Quote Link to comment Share on other sites More sharing options...
Matt B Posted October 15, 2011 Share Posted October 15, 2011 Some batteries do swell a bit, but if it doesn't usually do it then it will be reaching the end of its life. My old packs did that when they were worn out. Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 they are 2's 50c 5000mah, once they cooled down the swelling went down Quote Link to comment Share on other sites More sharing options...
Garry Posted October 15, 2011 Share Posted October 15, 2011 Swelling of more than 1-2mm is a sign that they are WAAAAAAAAAY overworked and shouldn't be used again. What packs are they? It sounds like its possible that they are fake, and aren't 5000mah 50C (more like 5000mah 15C or 20C). Quote Link to comment Share on other sites More sharing options...
NOFX Posted October 15, 2011 Share Posted October 15, 2011 Hi.Have a look on youtube for lipo fire . Hobbyking have some good turnigy lipos ,cheap. The nanotech ones are only about £25 for a 2s 5000mah 90 C Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 they are turnigy from hobbyking Quote Link to comment Share on other sites More sharing options...
danny boy Posted October 15, 2011 Share Posted October 15, 2011 how much did they balloon? If they have put a large gap between the two sides of the case i would just get rid of them, put them in a bucket of sand at the end of my garden maybe. Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 the case never came apart Quote Link to comment Share on other sites More sharing options...
Revorocks Posted October 15, 2011 Share Posted October 15, 2011 the case never came apart Oh, it will be fine then, quite a few people have problems with cases popping apart but the swelling still subsides and they can be used again. I am very surprised they swelled at all though in a Bullet Flux Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 ive put a 120amp esc and 6900kv castle motor in it Quote Link to comment Share on other sites More sharing options...
danny boy Posted October 15, 2011 Share Posted October 15, 2011 the case never came apart should be ok then, but just to make sure your safe charge them in a lipo safe bag and keep a good eye on them. Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 they are charging fine, just checked them balancing good aswell Quote Link to comment Share on other sites More sharing options...
big turbo Posted October 15, 2011 Share Posted October 15, 2011 How do you no that they ballooned if they are hard case and case did not split/separate ?? Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 15, 2011 Author Share Posted October 15, 2011 because the case ballooned, it you have had it happen you will know when one does Quote Link to comment Share on other sites More sharing options...
cbr6fs Posted October 16, 2011 Share Posted October 16, 2011 With LiPo chemistry cells there is an extremely thin polymer that separates the Cathode and Anode. If this separator splits due to the cells swelling then you will have a dead short inside the pack. What happens after this dead short really depends on a few things like how much energy (charge) the cells have, where they are and luck. At best you will have a lot of heat and smoke (the smoke of which is HIGHLY corrosive) at worst you will have a fire. There is no hard and fast rule for how much the pack can swell before this separator splits, i've seen 1 pack at the flying club swell to almost twice it's size and the bloke is still using 6 months on. I've also seen a pack swell only a few mm and go up in flames. So it's really 100% your choice and decision on if you want to continue using it or not. If you do i would mark it up and treat it like an egg till you dispose of it, as the separator will no doubt have been severally weakened and and something as simple as strapping it down or it banging about in the boot of your car could cause it to fail. With regards to why it failed, 100% agree with the previous posters. The cell has had more current drawn out of it than it can comfortably give, so it's swelled. I certainly would not use that cell for that application again, as if it swells again the chances of a fire will go up dramatically. another thing worth mentioning is that, if the pack has been stored fully charged this dramatically reduces it's C rating. So you could easily have a pack that's worked fine for 6 months, but each day it's stored fully charged it's ability to give current is reduced (C rating) to the point where it can no longer supply the needed amount of power. That will not get better only worse, so using it for the same application will only cause exactly the same thing again. Personally i'd stick a lamp on the terminals, leave it outside in a bucket of sand for a couple of days (well away from anything flammable) then take it to your local recycling centre to dispose of it. But for me seeing a £500+ RC car burn for the sake of a £30 battery doesn't warrant the risk. Cheers Mark 1 Quote Link to comment Share on other sites More sharing options...
big turbo Posted October 16, 2011 Share Posted October 16, 2011 Not doubting you just interested how you tell with hard case as I use 2s hard case if Eva happens to me I would not risk using again. Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 16, 2011 Author Share Posted October 16, 2011 just been out and within a couple of mins all the wires were very hotfrom the battery all the way to the motor, why would this be Quote Link to comment Share on other sites More sharing options...
TiM! Posted October 16, 2011 Share Posted October 16, 2011 Massive current draw. My bet is that there's something wrong with your ESC, motor, gearing or drivetrain. This is also probably what has made that lipo expand. Quote Link to comment Share on other sites More sharing options...
Matt B Posted October 16, 2011 Share Posted October 16, 2011 this is probably related to your chat post where you were saying that your car keeps cutting out, and everything gets very hot. What ESC/motor are you running, and in what car? Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 16, 2011 Author Share Posted October 16, 2011 its a bullet, 120amp hobbyking esc, 6900kv castle motor but was drawing too much current so put the original 4300kv flux motor back in, but it gets too hot so need a better motor, so gonna get a 3800kv Quote Link to comment Share on other sites More sharing options...
Revorocks Posted October 16, 2011 Share Posted October 16, 2011 You were running a 6900kv in a Bullet? I'm amazed it didn't melt down... Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted October 17, 2011 Author Share Posted October 17, 2011 why??? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.