3 years charging these lipo battries and no problem. 8-16-2013 my luck ran out.
I was charging a 3 cell 2200 mah lipo while I worked at the computer.
It caught FIRE near me. Got it out the door just in time.
It burns HOT and long.
I was charging a 3 cell 2200 mah lipo while I worked at the computer.
It caught FIRE near me. Got it out the door just in time.
It burns HOT and long.
Could have burned the place down to the ground.
Be CAREFUL.....PLEASE !
Be CAREFUL.....PLEASE !
Earl
It Caught FIRE near me. Got it out the door just in time. It burns HOT and long.
Be CAREFULL.....
Be CAREFULL.....
Comments
MLK Jr. Thank you for the science behind the puff! As someone with a passing interest in chemistry, and who has worked in the fire service, and dealt with explosives, this is a very interesting breakdown of the process of oxidation. To anyone unaware, in short, the difference between rust, fire, and explosions, is the rate at which something oxidizes. After reading this post, I came to realize I have a couple LiPos from my larger helicopters that need to be retired.
I have a basic question. What makes the batteries puff?
Good point Joe. The batteries went to space more than once, like 10 times. My other batteries that did not fly are not puffed.
Jason, must have been 200 or more cycles. I had the batteries for over 2 years.
Earl
Huh.... I don't have a lot to add, but I had a crash damaged and puffed Lipo that I decided to to have fun with one day. Put on fire-proof gear, and drove a nail through it. It was a 4S 5000, so I was expecting something impressive to happen, but it just smoked a little and that was it.
How many cycles you get thru that lipo?
I will try to give the facts of the lipo's (2) burns.
Brand:both Zippy from Hobby King
3 cell both 11.1 volt
8000mah on #2
2200mah on #1
hardly ever ballanced
Both batteries were swollen
Both charged at 2 or 3 amps (probably not wise)
Charger: From Hobby Kink 3 years ago. Thunder AC6 (has worked well for 3 years)
Batteries were 2 years old
many many many charge/discharge cycles
both batteries have been to 100,000 feet on a balloon flight
I think that is most of the history of the batteries.
Earl
Whatever happened with Earl, can happen to anyone, it happened to me also, four years back. Similar incident happened, entire house could have been burnt.
I am not bashing anyone's product but saying out of my experience that most of the lipos I purchased from Hobby King have swelled even at 2c discharge. I am really surprised and worried as well that even the Polyquest Lipo, purchased from Hobby King, got little bit swelled even at less than 8c discharging.
Some times due to such quality of lipos, I become so much worried that I wish if I could really find some brand may be very expensive but must meet atleast 80% of the stated specs on discharging and must not swell if always taken care that any cell is not allowed to go down by 3v during discharging.
Can someone help in finding that brand ? :(
This could be useful information but without details is just a general warning. A bit like saying "I threw a match in petrol and it went boom", be careful.
I'd be keen to know: What was the battery type, size, C-rating. What charger. Had the battery been damaged. How many cycles has it had. Has it had a hard life (discharge-charge rates). Was it being balance charged. What was the charge current. Did it burn early in the charge or later. etc....
It is good advice to store and charge in a safe place. I'd recommend, always balance charge, at 1C maximum and don't over-discharge. Make sure your charger never applies more than 4.2V per cell ever.
Of my 2200 batteries I have a couple that are a bit puffy that have been in use for over 18 months in that state. The amount of puff varies with charge state. They are always balance charged at 1C or less (often 0.5C) and used in low drain flight; about 18A peak drain on 2200 20C or higher rated Turnigy 3-cell. They still deliver good capacity. I've worn out (capacity failed) quite a few of these over the years. The only one that ever smoked was badly crunched in a crash and smoked for 5 minutes while in the wreckage.
Paul
Crud. Shows what I know. I had meant Energizer e^2 123 batteries. If I recall, they either have a lithium alloy or pure lithium inside. I also thought that LiPoly was "poly" because of the polymer electrolyte between the metal electrodes.
Oh, my experience: As a deliberate test I once hammered a nail through a 3S 2650 mAh pack. There were room-filling quantities of smoke and some sparks within 5 seconds. This was done outdoors in a non-flammable area with everything on the end of long poles.
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