What is under our battery labels

[4Cutekids]

The label on the bottom of all of my batteries have gotten puffy. I assumed it was just adhesive gas from the sticker getting hot over and over and made a small hole for the gas to escape but the smell was odd. Peeled back the label and the material underneath got white and is bubbling like there is air under it but is not hot to the touch. Anyone know what that is? Wondering if I need to trash all my batteries. Doesn’t seem to make sense that there would be anything important or dangerous just under those labels but who knows. No sign of adhesive in the traditional sense so it has me concerned I should not use them as I can’t account for the gas/smell. I would hope these batteries are better sealed and made then to have anything dangerous under something as flimsy as a foil label.

I figured out what the smell reminds me of. Those plastic balloons that come in a tube which we would inflate with a tiny straw as kids.

 

[BossBob]

Pretty sure that what you’re looking at is the actual battery pack. LiPO batteries are not your usual cylinder, they are more like envelopes containing the electrodes and electrolyte. Puffed batteries are prone to failure. New batteries, or new drone due to battery failure in flight?

 

[Kilrah]

The sticker is straight on the actual cell.

 

[Clinton1]

It seems like you just poked a hole in your battery cell i will not let that battery sit anywhere that it can burn something down. Preferably outside, on concrete.

 

[Ken K]

The label on the bottom of all of my batteries have gotten puffy..

Do not use these batteries. They must be replaced.
How many batteries have "puffed"? (You refer to "all of my batteries".)
What charger have you been using?
Perhaps @Thunderdrones can comment.

 

[Former Member]

OP, the fumes you are smelling could be toxic or explosive. Not joking. I would get all the batteries out of your house.

 

[Jackcutrone]

I agree with 4cutekids. Don’t use the batteries. If they are puffing they are going bad. And poking a hole in a lipo battery is never a good idea. You can easily short the battery out. Lipo batteries will burn at high temperature for a time if shorted. Many lipos will eventually begin to puff up after many charge-discharge cycles but if your charger is putting out too many amps that can also cause puffing. If your batteries are not older ones with many cycles I too would suspect a charger issue. You sure don’t want your battery to catch fire while you are flying.

If you are in the states bring the batteries to Home Depot. They accept old batteries for recycling/ disposal.