Why is my battery leaking fluid

[dave_jasinski]

I have several U1-12RT Valence batteries, Lithium Iron Magnesium Phosphate. They are all a few years old. Yesterday, I noticed a clear fluid on the floor underneath a few of them. I don't know where the fluid came from. I haven't seen any signs of leaking, bulging, etc. None of the batteries are connected to a load or a charger; they are just sitting there disconnected in my air conditioned basement. I have not checked the voltage of any of them yet. Any idea what this is? I didn't think that these batteries had anything internal that could cause this type of fluid leak. Any help is appreciated.

 

[wpns]

Condensation?

 

[fratermus]

Any idea what this is?

Does it have a distinctive smell? My understanding is that LFP electrolyte has an acetone or some other chemical smell. Luckily I haven't experienced it directly.

 

[Kornbread]

My guess is that the battery uses pouch cells. According to another post, keeping pouch cells sealed long-term is an issue.