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Unknown situation with Lipo

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White_Crow_G

RCTalk Champion
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After run i forgot to take the battery out from a car (car was switched off)
and after 5 days i found this on my charger... 3s instead of 4s and the voltages...
even battery tester didn't show anything due to low voltage.
charger says something like "error balance cable connection"
everything was fine when running
Is it me did something critical and kill my lipo?

Untitled-1.webp
 
If you checked and double checked your balance cable connection and there is nothing physically wrong with it, you killed a cell. Even the cells that still have enough energy to produce a reading are well out of balance (cell #3). That battery is now volatile and needs to be disposed of.

Yes, you will find methods online (and others may suggest them here) to "restore" a lipo after a severe discharge like this. But, since you are here asking this question, I do not think you have the experience to attempt such a thing. I promise I do not mean that in any negative light, at all. I have a friend who lost his entire home and 2 vehicles to a lipo charging incident and I hope to help people never let that happen to them.
 
If you checked and double checked your balance cable connection and there is nothing physically wrong with it, you killed a cell. Even the cells that still have enough energy to produce a reading are well out of balance (cell #3). That battery is now volatile and needs to be disposed of.

Yes, you will find methods online (and others may suggest them here) to "restore" a lipo after a severe discharge like this. But, since you are here asking this question, I do not think you have the experience to attempt such a thing. I promise I do not mean that in any negative light, at all. I have a friend who lost his entire home and 2 vehicles to a lipo charging incident and I hope to help people never let that happen to them.
i'm not one of those persons who will take a risk of fire to save 40 pounds.
I have resigned myself to utilize it.
Mainly i want to learn a lesson - WHAT exactly i did wrong (to avoid in futre...i just newbie in a hobby and it's one of my first packs so far)
 
Mainly i want to learn a lesson - WHAT exactly i did wrong (to avoid in futre...i just newbie in a hobby and it's one of my first packs so far)
You left it connected to the ESC for 5 days.

Even though the car was powered off and even though ESCs do not consume any voltage when powered off, there is still voltage seeping out of the battery when plugged into a connector. You always have to disconnect your battery from the ESC when you're storing a vehicle.
 
You left it connected to the ESC for 5 days.

Even though the car was powered off and even though ESCs do not consume any voltage when powered off, there is still voltage seeping out of the battery when plugged into a connector. You always have to disconnect your battery from the ESC when you're storing a vehicle.
45gbp lesson learned.
Thank you
 
I'm glad it only took you one, I've got i think 5 batteries I've killt in this exact way, i like the trucks that dont have a power switch, then i HAVE to unplug the truck to turn it off, it was hard to teach myself to ignore the switch and power the truck off by removing the battery, but I've killed fewer batteries since adopting that practice
 
Dude…..

You do not have the luxury of “I forgot” when it comes to Lipo’s… It’s not “if”, it’s “WHEN”, because you WILL burn your house down doing that. Number one rule sir.. $45 bones is nothing, and if that’s your worry-you have missed the point by a mile.. Also it’s not that you left it plugged in-it’s that when you are done running you disconnect, remove, and verify voltage. THEN bring to storage charge. None of this would’ve been possible had you done any of those. And your risk of losing far more than “45 Pounds”.. Hope you take it seriously in the future, and have better luck.
 
Dude…..

You do not have the luxury of “I forgot” when it comes to Lipo’s… It’s not “if”, it’s “WHEN”, because you WILL burn your house down doing that. Number one rule sir.. $45 bones is nothing, and if that’s your worry-you have missed the point by a mile.. Also it’s not that you left it plugged in-it’s that when you are done running you disconnect, remove, and verify voltage. THEN bring to storage charge. None of this would’ve been possible had you done any of those. And your risk of losing far more than “45 Pounds”.. Hope you take it seriously in the future, and have better luck.
Thank you @Littlemotor! I do really take it serious!
I love the way you telling about LiPo's. (it worth it)
I read plenty different threads about "how to" about lipo...but...
may i ask you to do me a HUGE favor. Would you be so kind to do me a list of what and how to do before and after running. as all i've learned from other threads is mainly - to put it on storage charge if i will not run for next 5-7 days
So i will (i believe, not only me) really appreciate if you could do this for me
like (as an example)
after finish driving
1 - take lipo back home
2 - unplug from rig
3 - charge it on 41c charging rate
4 - call fire-fighters
(like for 3yo kids...or idiots....please)
 
Turn off vehicle.
Disconnect at plug.
Remove LiPo.
Turn on charger.
Set to storage charge mode.
Hook up LiPo.
Wait until storage charge achieved. Do NOT leave LiPo unattended.
Store LiPo in LiPo safe box, bag, container, etc.

EVERYTIME. Under no circumstances should your battery be stored at anything other than storage charge. Ever.
 
dont wanna be this guy lemme tell you. this dumb put his battery on a charger and then took a nap,
dont be this guy. everyone should SHAME this guy
and yeah... I'm that guy. almost lost it all

20250729_143936.webp


20250729_143941.webp
 
Turn off vehicle.
Disconnect at plug.
Remove LiPo.
Turn on charger.
Set to storage charge mode.
Hook up LiPo.
Wait until storage charge achieved. Do NOT leave LiPo unattended.
Store LiPo in LiPo safe box, bag, container, etc.

EVERYTIME. Under no circumstances should your battery be stored at anything other than storage charge. Ever.
more then clear for me.
thank you.
if i got you right - even if i'm planning to run tomorrow, today i MUST store-charge\discharge my batteries ant put into bag.
Thank you.
I will follow your advice
 
dont wanna be this guy lemme tell you. this dumb put his battery on a charger and then took a nap,
dont be this guy. everyone should SHAME this guy
and yeah... I'm that guy. almost lost it all

View attachment 243147

View attachment 243148
I will!
i mean I WILL NOT )))
Thank you

it seams like everyone of you has his own story to tell about lipo )
 
dont wanna be this guy lemme tell you. this dumb put his battery on a charger and then took a nap,
dont be this guy. everyone should SHAME this guy
and yeah... I'm that guy. almost lost it all

View attachment 243147

View attachment 243148
Did you blow into the plug? Geez
Lots of air in there... Well its gas plus air but.

take it out in the alley and throw a nail into it. makes cool fireworks. ;)
 
I think almost everyone has lithium - polymer or lithium - ion batteries laying around being used and taken care of very casually. Cell phones , weed wackers, etc. I sure do, and don't take any precautions and never worry about them exploding or catching fire.
I don't know what type of batteries are in modern electric cars. I never saw one with flames shooting out the back though.
 
I think almost everyone has lithium - polymer or lithium - ion batteries laying around being used and taken care of very casually. Cell phones , weed wackers, etc. I sure do, and don't take any precautions and never worry about them exploding or catching fire.
I don't know what type of batteries are in modern electric cars. I never saw one with flames shooting out the back though.
its like you're trying to convince us that the fires dont happen lol, they do, like it or not, just because you personally havent had it happen isnt a good reason to downplay the very REAL danger these batteries pose. a little caution and preparedness can save a lot of damage.


in referance to your ecar comment:
With EVs, there's no tank of explosive fuel and, compared to a gasoline or diesel engine, electric motors don't generate that much heat. So why then do they catch fire?
In short, it's chemistry. The chemicals and elements that make up the individual cells inside an electric vehicle's battery pack are very sensitive. This is especially true with the lithium-ion chemistry that most modern EVs use. If an EV is in a very serious crash and the battery pack is compromised, battery cells can rupture, and they will heat up until they hit a point called "thermal runaway."
Thermal runaway occurs when a battery's cells get so hot that chemical reactions begin to occur, and the heat, in most cases, continues to increase uncontrollably. At this point, the cells can catch fire, which cascades throughout the pack until you have an EV burning to the ground.
Battery cells that are improperly charged or balanced can also cause thermal runaway. Lithium-ion battery packs are very sensitive to how they are charged. Each cell in the battery module needs to be charged to a level similar to its neighbors or it could overheat, and again you can get thermal runaway and a crispy car.
Modern electric cars cool their battery packs in one of two ways to help mitigate the risk of thermal runaway and to help the pack function at its most efficient. Older EVs and less expensive EVs tend to use air cooling. This means that the enclosure for the battery pack is built to dissipate heat as air moves over it. Higher-end EVs use a liquid cooling system that circulates coolant throughout the cells via a radiator and fans to dissipate the heat stored there, similar to the radiator in a gas-powered car.

cell phones:
https://nypost.com/video/horrifying-moment-phone-bursts-into-flames-in-womans-back-pocket/


i hope you dont ever have to experience one of these, but to suggest that because it hasnt happened to you so its not real? or not worth worrying about?
thats just plain and simple BAD ADVICE.
 
I absolutely gave NO advise to anyone concerning anything.
I said most of us have these types of batteries in our cell phones, weed wackers, etc. If you look in peoples garages you will see these and they almost certainly won't be kept in protective containers. Mine sure aren't.
 
I absolutely gave NO advise to anyone concerning anything.
I said most of us have these types of batteries in our cell phones, weed wackers, etc. If you look in peoples garages you will see these and they almost certainly won't be kept in protective containers. Mine sure aren't.
well. just a think for you to think about - how many of your nonRC lipos are connecting via 3-4mm wires
not trying to pull you to dark side, just so you aware
 
My view on this situation:

If you take care of your batteries, ie making sure they are balanced, storage charge after every run, store them safely and don't leave them plugged in OR sitting in the actual car, looking at IRs from time to time to determine cell health to be safe, you will be just fine. Just my 2 cents.

IMHO charge rate/amps do NOT affect battery life or health. It can only affect it if you're not using it right or being safe.
 
I think almost everyone has lithium - polymer or lithium - ion batteries laying around being used and taken care of very casually. Cell phones , weed wackers, etc. I sure do, and don't take any precautions and never worry about them exploding or catching fire.
I don't know what type of batteries are in modern electric cars. I never saw one with flames shooting out the back though.

Apples to oranges. Do a search bud. And don’t spread misinformation that could get someone killed because you have no idea what you’re talking about. We have literally had burn victims post up on this exact forum that burned down their entire apartment building with their LiPo packs “that you personally have never seen flames coming out of it”. Don’t be an idiot.
 
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