Is this battery swolen?

[Andy172]

Hello all,

I have this P4A battery that looks to be a little swollen, but I want to confirm. It looks like the cells are expanded about half way through the ventilation holes. You can still see through to the other side. The outside of the battery is not swollen at all

 

[lasersbee]

Can't see anything on that pic. Take a ruler and see if all
the flat sides of the battery are still flat.

Jerry

 

[cheddarman]

Does it slide easily in and out of the drone casing??? If not, swollen.