RCCrawler Forums

Rockbutt · 09-04-2008, 04:26 PM

I am new to this hobby and i'm not sure if this realy is a problem...

After 3/4 hours of serious crawling and speed climbing with my 10 pound rig,I could feel the voltage was getting low. the 3s lipo got bigger like air pressure in it .It was just warm to toutch. I used a needle to let the pressure out of one cell ...pfff... I can not use an inflating battery because it is rubing on the outrunner.

Now i'm not sure what to do with it. should i try to charge it ?
Should i make a small hole in each cell to let the pressure out as it get warm ?

Any advice would be apreciated

Mike

Robb · 09-04-2008, 04:34 PM

You should properly discharge the battery (in salt water), and dispose of it properly.

joaquinriviera · 09-04-2008, 04:36 PM

I would get rid of the battery and definetly don't charge again or puncture with a needle

dezfan · 09-04-2008, 04:36 PM

DO NOT PUNCTURE THE CELLS!!!!

It sounds like you have allowed the cells in the pack to drop below 3.0 per cell which is the lowest voltage you should allow a lipo cell to reach.

What ESC are you using? Does it have a LVC?

yarddog35 · 09-04-2008, 05:08 PM

[quote=Rockbutt;1331206]I am new to this hobby and i'm not sure if this realy is a problem...

After 3/4 hours of serious crawling and speed climbing with my 10 pound rig,I could feel the voltage was getting low. the 3s lipo got bigger like air pressure in it .It was just warm to toutch. I used a needle to let the pressure out of one cell ...pfff... I can not use an inflating battery because it is rubing on the outrunner.

Like dezfan said NEVER PUNCTURE A CELL! You should know that with any battery not just lipo

PLEASE take time to read ALL of the directions on lipo batteries. Discharge the pack below 2.5v then cut the wires off (ONE AT A TIME) and dispse. Lipo batteries are extremely safe unless they are used improperly, over charge/discharge, overheating and PUNCTURING all can cause explosion and fire. BE CAREFUL they can do alot of damage.

Rockbutt · 09-04-2008, 05:22 PM

Quote:

Originally Posted by dezfan

DO NOT PUNCTURE THE CELLS!!!!

It sounds like you have allowed the cells in the pack to drop below 3.0 per cell which is the lowest voltage you should allow a lipo cell to reach.

What ESC are you using? Does it have a LVC?

Mambamax at 9v.
I did feelt a very low voltage a few runs ago !

At the moment i feel i have a defective LVC...?

chris4207 · 09-05-2008, 05:59 PM

It may not be the cut off. How are you charging packs? If they are not balanced when charging. One of the cells can easily drop to low. I set my cut off at 9.2 just to be safe and i balance them with a "Blinky balancer" everytime i charge them. I havent had a problem yet.

tk5028 · 09-06-2008, 11:51 AM

WOW!!!!

You are lucky. Look up lipo fires on youtube and see what can happen. Make sure you read everything you can find on lipo information. As said above, they are safe as long as you follow the rules.

Oh yeah, this is usually known as "puffing."

Joat · 09-06-2008, 11:58 AM

Quote:

Originally Posted by chris4207

It may not be the cut off. How are you charging packs? If they are not balanced when charging. One of the cells can easily drop to low. I set my cut off at 9.2 just to be safe and i balance them with a "Blinky balancer" everytime i charge them. I havent had a problem yet.

Or drawing to much current -burst current, also puffs cells.

hitman46mod · 09-06-2008, 12:24 PM

Quote:

Originally Posted by Joat

Or drawing to much current -burst current, also puffs cells.

I had a 3s drop to 2.8v in one cell and it puffed a little. The cell was also about 126 degrees and the time. I let it cool and and checked the voltage. The cell was back at 3v. So I discharged and balanced charged the pack it was fine. But why would you puncture it? I had a cell get cut and it leaked and would not hold a charge. So give it time and the cell you punctured will die.

phillyb · 09-06-2008, 04:00 PM

Time to toss that pack. There was a writeup in one of the mags. Page 102, RC Car, Oct 2008.

Might want to check it out.

Looks like you should have that thing in a fireproof bucket or something and discharge completely, until it hits less than .5v per cell then its completely safe and can be thrown away.

Lipo are extremely dangerous fire hazard.

BTW I simply MUST know what pack it was, the C rating and Mah ratings, and your electronics combo. Where did you have it mounted as well.

Rockbutt · 09-06-2008, 04:12 PM

Thanks for all the have to know info...

The pack is dieying in a plastic bucket filled with water and it's just fun to see it create some hydrogen bubbles.
I will test the voltage in a few days...

JavelinSST390 · 09-06-2008, 04:31 PM

GET THAT THING OUT OF THE WATER!!!!!!

Lithium + water = BOOOOOOOOM!!!!!!!

http://www.youtube.com/watch?v=8ypUVpwgcAA

ManxCrawler · 09-06-2008, 04:36 PM

There's no believing some folk

Rockbutt · 09-06-2008, 08:55 PM

Quote:

Originally Posted by Robb

You should properly discharge the battery (in salt water), and dispose of it properly.

Water...salt water ??? luckily my life does not realy depend on this

all this make me laugh (but don't worry, i use caution when doing new experiment)

OK, i will take it out of the water and ....do what ? Probably throw it in a big fire or just compress it on the 30 tons hydraulic press ? Humm did not see that one on youtube

!

I'm sure i can learn more about lipos....

JavelinSST390 · 09-06-2008, 09:02 PM

oops... sorry. I didn't notice that someone had put salt water on there... my bad.

yarddog35 · 09-06-2008, 09:04 PM

Quote:

Originally Posted by Rockbutt

Water...salt water ??? luckily my life does not realy depend on this

all this make me laugh (but don't worry, i use caution when doing new experiment)

OK, i will take it out of the water and ....do what ? Probably throw it in a big fire or just compress it on the 30 tons hydraulic press ? Humm did not see that one on youtube

!

I'm sure i can learn more about lipos....

Dude what ever your on, I want some.

braceysdad · 09-06-2008, 09:05 PM

So you guys are saying that putting one in a microwave or toaster is not a good idea?

sparky0068 · 09-06-2008, 09:11 PM

Quote:

Originally Posted by braceysdad

So you guys are saying that putting one in a microwave or toaster is not a good idea?

What about toaster oven, convection oven, brick oven, waffle iron, coffee pot, blender...

Rockbutt · 09-07-2008, 03:33 PM

Quote:

Originally Posted by yarddog35

Dude what ever your on, I want some.

HeHe... To bad, the 3s lipo did nothing interesting under 40,000 pounds of pressure. A bit warm,the 1001 remaining pieces of flaky cells were put in WATER .Hoouuu scary ! but.........

These lipos are not that fun

........

09-04-2008, 04:26 PM	#1
Rockbutt Rock Stacker Join Date: Mar 2008 Location: Canada Posts: 60	Problem, Lipo inflating I am new to this hobby and i'm not sure if this realy is a problem... After 3/4 hours of serious crawling and speed climbing with my 10 pound rig,I could feel the voltage was getting low. the 3s lipo got bigger like air pressure in it .It was just warm to toutch. I used a needle to let the pressure out of one cell ...pfff... I can not use an inflating battery because it is rubing on the outrunner. Now i'm not sure what to do with it. should i try to charge it ? Should i make a small hole in each cell to let the pressure out as it get warm ? Any advice would be apreciated Mike

09-06-2008, 04:00 PM	#11
phillyb Rock Crawler Join Date: Nov 2004 Location: roanoke Posts: 550	Time to toss that pack. There was a writeup in one of the mags. Page 102, RC Car, Oct 2008. Might want to check it out. Looks like you should have that thing in a fireproof bucket or something and discharge completely, until it hits less than .5v per cell then its completely safe and can be thrown away. Lipo are extremely dangerous fire hazard. BTW I simply MUST know what pack it was, the C rating and Mah ratings, and your electronics combo. Where did you have it mounted as well. Last edited by phillyb; 09-06-2008 at 04:05 PM.

09-04-2008, 04:34 PM	#2
Robb RCC Addict Join Date: Aug 2005 Location: VARCOR Posts: 1,826	You should properly discharge the battery (in salt water), and dispose of it properly.

09-04-2008, 04:36 PM	#3
joaquinriviera Newbie Join Date: Mar 2008 Location: Merced Posts: 16	I would get rid of the battery and definetly don't charge again or puncture with a needle

09-04-2008, 04:36 PM	#4
dezfan I wanna be Dave Join Date: Dec 2005 Location: Happiness is a warm AK. Posts: 12,563	DO NOT PUNCTURE THE CELLS!!!! It sounds like you have allowed the cells in the pack to drop below 3.0 per cell which is the lowest voltage you should allow a lipo cell to reach. What ESC are you using? Does it have a LVC?

09-04-2008, 05:08 PM	#5
yarddog35 Pebble Pounder Join Date: Jun 2007 Location: nor cal Posts: 180	[quote=Rockbutt;1331206]I am new to this hobby and i'm not sure if this realy is a problem... After 3/4 hours of serious crawling and speed climbing with my 10 pound rig,I could feel the voltage was getting low. the 3s lipo got bigger like air pressure in it .It was just warm to toutch. I used a needle to let the pressure out of one cell ...pfff... I can not use an inflating battery because it is rubing on the outrunner. Like dezfan said NEVER PUNCTURE A CELL! You should know that with any battery not just lipo PLEASE take time to read ALL of the directions on lipo batteries. Discharge the pack below 2.5v then cut the wires off (ONE AT A TIME) and dispse. Lipo batteries are extremely safe unless they are used improperly, over charge/discharge, overheating and PUNCTURING all can cause explosion and fire. BE CAREFUL they can do alot of damage.

09-05-2008, 05:59 PM	#7
chris4207 Quarry Creeper Join Date: Aug 2008 Location: Northern, Mi Posts: 324	It may not be the cut off. How are you charging packs? If they are not balanced when charging. One of the cells can easily drop to low. I set my cut off at 9.2 just to be safe and i balance them with a "Blinky balancer" everytime i charge them. I havent had a problem yet.

09-06-2008, 11:51 AM	#8
tk5028 Rock Stacker Join Date: Aug 2008 Location: Lincoln Posts: 86	WOW!!!! You are lucky. Look up lipo fires on youtube and see what can happen. Make sure you read everything you can find on lipo information. As said above, they are safe as long as you follow the rules. Oh yeah, this is usually known as "puffing."

09-06-2008, 04:12 PM	#12
Rockbutt Rock Stacker Join Date: Mar 2008 Location: Canada Posts: 60	Thanks for all the have to know info... The pack is dieying in a plastic bucket filled with water and it's just fun to see it create some hydrogen bubbles. I will test the voltage in a few days...

09-06-2008, 04:31 PM	#13
JavelinSST390 Rock Crawler Join Date: Jul 2007 Location: Rectalville Posts: 889	GET THAT THING OUT OF THE WATER!!!!!! Lithium + water = BOOOOOOOOM!!!!!!! http://www.youtube.com/watch?v=8ypUVpwgcAA

09-06-2008, 04:36 PM	#14
ManxCrawler Quarry Creeper Join Date: Sep 2008 Location: Isle of Man Posts: 469	There's no believing some folk

09-06-2008, 09:02 PM	#16
JavelinSST390 Rock Crawler Join Date: Jul 2007 Location: Rectalville Posts: 889	oops... sorry. I didn't notice that someone had put salt water on there... my bad.

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09-06-2008, 09:05 PM	#18
braceysdad Adilynsdad too! Join Date: May 2004 Location: G ville Posts: 8,844	So you guys are saying that putting one in a microwave or toaster is not a good idea?

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