Sony VTC4 black blotch

[Skin-E_281]

Like the title says I've run into an issue with one of my 18650 VTC4. There is a light black blotch on the negative side. It was small but has spread a bit. Has anyone else run into this problem. And if anyone knows why this is happening could you please enlighten me.

Thanks in advance

 

[jwag1973]

Can you post a pic?

I would not be using that battery if you suspect any type failure!

 

[BeRight]

Never heard nor seen this before: wild guess might be from your end cap/button for battery rubbing or dissimilar metal of button.

 

[suspectK]

Since it's your safety, consider it vent damage.

37, ph0n3 h0m3.

 

[Skin-E_281]

I'll post a pic when I get home.

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[Skin-E_281]

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[Skin-E_281]

Apparently I can't post pics off of my phone. And since I don't have a PC only my phone. No photos. I've just stopped using it since the blotching under the green wrapper has spread. Looks I'm down to my second vtc4.

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[Ryedan]

Like the title says I've run into an issue with one of my 18650 VTC4. There is a light black blotch on the negative side.

Read this thread Skin-E_281. I suspect it's the same thing but I haven't seen pics of your batteries. Let us know either way

 

[Skin-E_281]

Thank you Ryedan. This is exactly what's happening to mine. I was worried because i couldn't find anything relating to it. But seems like I'm not alone.

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[jwag1973]

I had the same type discoloration on a week old Sony VTC4. I bought it locally at a shop whom I trust to sell genuine batteries. They exchanged it and claimed to have not seen this type issue before. They thought mabey liquid had caused it, I was unsure and asked to have it replaced.

I used that battery at .6-ohm for a very short time, a few hours max. I wrapped a new coil at .9 and the rest were at 1.1-ohm. It was never to my knowledge hot while being used or being charged.

I don't believe it was caused by liquid either. I'm still unsure and would love to know the cause.

The batteries performance in all phases seemed to be normal. I have six VTC4's and two VTC5' Sony's, I feel they are good batteries, just want to know what's causing this issue.

 

[Ryedan]

The batteries performance in all phases seemed to be normal. I have six VTC4's and two VTC5' Sony's, I feel they are good batteries, just want to know what's causing this issue.

If you read the thread I posted a link to you'll see that we worked through a lot of possibilities. I cut the plastic sheath off the MNKE battery in the end and found no issues inside. IMO it's just the way the sheath lays on the battery casing. All my 18650VTC3 and 4 batteries show some evidence of this effect when I look closely, but none seem to be harmed in any way.

 

[Kemosabe]

Read this thread Skin-E_281. I suspect it's the same thing but I haven't seen pics of your batteries. Let us know either way

my thoughts exactly. i had a strong feeling it was the same thing from that other thread.

 

[jwag1973]

If you read the thread I posted a link to you'll see that we worked through a lot of possibilities. I cut the plastic sheath off the MNKE battery in the end and found no issues inside. IMO it's just the way the sheath lays on the battery casing. All my 18650VTC3 and 4 batteries show some evidence of this effect when I look closely, but none seem to be harmed in any way.

Ryedan, I did read the whole thread you provided the link to before i made my post. I saw the pics of the batteries as well. I was under the impression the cause was still unknown. I saw you found no obvious damage to the MNKE. The way I read it, it was still undetermined as to what positively was causing the discoloration.