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Battery slight discolor, should I be concerned?

GrafXXX

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Hello
I read a lot about battery swelling or batteries becoming stuck in the drone, unable to remove the battery. I recently noticed this dark mark on on the back side of one of my ma2 batteries. It’s smooth no scuffs or scratching, just discolor. HEAT related? Thoughts?
Thanks in advance 0925D807-DEAC-4FB1-AACB-F482940D7038.jpeg 49E7C136-2157-4554-ABE9-26BE4E25B124.jpeg A68FD91E-AED2-456D-BEE1-A829B76DCE0B.jpeg 91DD6685-6E33-427B-83AA-22F7FB771CA7.jpeg
 

GrafXXX

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I thought same thing but it won’t come off, I have a Screen print shop and sign shop, so I have mild cleaners up to hazardous cleaners, nothing wipes it off

it’s very weird
 

SmilingOgre

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Doesn't look to be heat induced. You could try either GooGone (breaks adhesion) or even an abrasive pad.
 

Thomas B

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Or just fly with it. You can’t see it from 15-20’ away and if it was some sign of malfunction seeing the mark would keep you hypervigilant for problems when you use it or inspect pre/post flight.
 
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GrafXXX

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Well i feel better that no one said, DON"T USE IT, THATS A BAD SIGN. So ill just keep an eye on it its just weird that its discolored there, I was thinking of using some of the good ( respirator required ) cleaning solvents I have in my shops yellow liquid storage fire cabinet but I think I'll keep the unique look and if anyone asks i'll just tell them its a special edition 90 minute battery or something

thanks
 

mavicn00b

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FWIW some of my batteries have green scuff marks from when the time the drone became closely acquainted with nature (hit a tree) :) - Batteries are fine.