Why do some of my batteries "whistle"?

[Eranda13]

I have a bunch of 808 batteries, they work fine- but two of them make this whistling kind of noise when I drag on them. Not loud, but enough to bug me- and the other ones don't do that. Any idea why they do that- and more important, how can I make it stop??

 

[Marius_Kingsley]

Are they all identical?

 

[Eranda13]

Yes I have 5 V2 auto batteries, all the same size. Only two do the whistling noise...?

 

[Marius_Kingsley]

Yes I have 5 V2 auto batteries, all the same size. Only two do the whistling noise...?

That's weird. I have no idea.

 

[drewbalicious]

Have you tried changing the speed/strength of your drags, to see if it lessens or amplifies the whistle? Could be something as simple as the air channels are a little tighter or smaller on 2 of the batteries causing them to whistle.

 

[Eranda13]

With these two in particular, it doesn't seem to matter what I do. I just generally hold my fingers over the air holes LOL. Guess I'll keep doing that

 

[23duncster23]

Is it constantly whistling when powered or only when you take a drag?

 

[Joe A]

My guess is its the way you air in tanks line up due to threading.