Dark Spots Showing Under battery Wrap VTC4 & VTC5's 18650

[Ryedan]

I have 2 CTV3 and 2 VTC4 and have not seen this with mine nor have I seen this reported by anyone else. You're using 4 different mods and have bought these batteries from 4 different sources, one of which you sound pretty sure is reputable. I'm stumped.

I doubt this is dangerous in itself, but not knowing why it's happening would drive me crazy and if it went too far it could become dangerous.

I assume you have a few of these batteries. What I might try is cleaning a few of them well and replacing the heatshrink wrappers. Check for any damage to the metal battery casing when you have the wrappers off. Here's some heatshrink from DealExtreme to give you an example of what it is and here's a tutorial on re-wrapping a battery.

Clean the inside of the mods well with a good alcohol wipe-down too. After that put one battery away without using it, and use each of the other batteries in one mod only.

FYI, there are some pictures of normal battery wrapper discoloration in this thread. This is totally different from what you're experiencing, just thought I would mention it.

Hopefully someone else chimes in with a real solution. Until then trying to isolate the cause is all I've got.

 

[Ryedan]

the dark spots issue is happening to most of the batteries

So it's not happening to all of them. How many is it happening with and how many are OK? What is the difference between the two sets? Mods they are used in, where they were bought or anything you can see is different.

 

[dubliquid]

So it's not happening to all of them. How many is it happening with and how many are OK? What is the difference between the two sets? Mods they are used in, where they were bought or anything you can see is different.

Ryedan, basically, every battery starts off with a really small pin head minor spot. Then over time ( example 2 weeks or so heavy vaping ) the spots grow. some are worse than others but as you said i really need to try identify which ones are growing dark spots faster and try pin point a problem with mod, different sets ect.

all the bats are fine for about a week, then i see one spot, then 2 etc..

and yes i have spares and have stopped using the worst ones.. ive ordered some shrink wrap and will clean and replace all of them.. then, i think ill use one bat for each mod and try identify what one gets effected.

ty for the links, i've already seen those normal battery wrapper discoloration threads and understand this is normal due to heating. Seems the dark spots start off with that discoloration around a speck of dust then some kind of minor burnin or oxidization takes place..

will take your advice and stick to using 1 bat for each mod. also ill order some new batteries to be on the safe side.

ty for your info Ryedan, appreciated.

 

[B1sh0p]

The shells can have minor leaks in them and the battery's can vent through the wrap. I've had it happen on a vtc 3. I'd get rid of them.

Make sure the wraps don't have any cuts in them.

 

[ImThatGuy]

Keep us updated...I still say molds...LOL jk

 

[TheSystemHasFailed]

isn't that a sign of some kind of arcing going on tho ?

No Ma'am. It's a manufacturing side effect. They crank them out in high numbers.

Now, what OP was showing, that is diff.

EDIT: Read the "Cloud Chasers" FB group. A few of the prerequisetes are "don't ask if your battery discoloration is normal". As it is.
Now, like I said, Can you show the outside of the wraps?

 

[weinner]

This happened to one of mine actually

 

[Ryedan]

Can you show the outside of the wraps?

I believe that was shown in post #13.

 

[Ryedan]

This happened to one of mine actually

Did you figure out a cause or a solution weinner?

 

[twizted]

I too think that is mold between your battery & wrapper.

Sent from my Nexus 10 using Tapatalk

 

[dubliquid]

clarification on the outside and inside


outside wrap


inside wrap

 

[dubliquid]

I too think that is mold between your battery & wrapper.

Sent from my Nexus 10 using Tapatalk

it's not mold mate, i can confirm its not mold.. the battery is only 6 weeks old and small spots are showing on newer ones too.

 

[twizted]

it's not mold mate, i can confirm its not mold.. the battery is only 6 weeks old and small spots are showing on newer ones too.

You never know if they was ever wet before you purchased them.

Sent from my Nexus 10 using Tapatalk

 

[Ryedan]

The shells can have minor leaks in them and the battery's can vent through the wrap. I've had it happen on a vtc 3. I'd get rid of them.

Now that's one I haven't heard before B1sh0p.

When I first saw this picture I thought the highlight in the red circle could be a puncture, but then I thought it must just be the way the light hit that area. This is definitely something to check for specially now that we know it has happened before.

 

[dubliquid]

You never know if they was ever wet before you purchased them.

Sent from my Nexus 10 using Tapatalk

bought form 4 different vendors at different times and same issue

 

[Ryedan]

You never know if they was ever wet before you purchased them.

I've put my K100 in a coffee cup a couple of times (don't ask ) and washed the battery afterwards. They didn't soak, but I know a bit of water on them is not going to cause mold

 

[ImThatGuy]

clarification on the outside and inside


outside wrap
View attachment 361110

inside wrap
View attachment 361111

I'll refrain from the mold assumption. Looks like it started from the inside and shows through the outside. Those look like burn marks.

 

[Ryedan]

I'll refrain from the mold assumption. Looks like it started from the inside and shows through the outside. Those look like burn marks.

But if they're burn marks, why the clear spot in the middle? Besides, batteries don't get hot in small areas like these and cooler on the rest of surface.

 

[twizted]

I know some metals will develop black discoloration when exposed to humidity.
Aluminum wheel with similar looking black spot coloration.

Sent from my Nexus 10 using Tapatalk

 

[dubliquid]

I'll refrain from the mold assumption. Looks like it started from the inside and shows through the outside. Those look like burn marks.

agree they do look like burn marks, although after some cleaning on one side of the wrap the marks rub off.