We just picked up our second CMAX, a SEL, The first is an SL. Anyway, I opened the back to notice a pool of acid in the battery container that the LV battery sits in. I pulled the battery and thoroughly rinsed the acid out with water and baking soda, and I did the same to the battery. But the big question is how did the acid get there in the first place? I placed the battery on a piece of paper after I dried it off and found it was not leaking. I held it upside down and also found it was not leaking. There was nothing apparently wrong with the battery other than that it had a red eye even though I just drove the vehicle an hour prior.
Anyway, our SL LV battery looks perfectly fine. Zero leaks whatsoever. I am thinking that the acid came out of the exhaust port. There are only two things I can think of. 1: the battery was overfilled at the factory. 2: the charge voltage is too high which is causing the acid to boil and leak out of the port hole. This can happen above 15v on some batteries.
I also noticed that the exhaust port on my SEL is different than the one on the SE. On the SE there is a tube that exits the battery box and runs about 5" below the box. Same with the tube on the HV battery. But on my SLI there is no such tube. There is a rubber extension that sticks out of the battery box for about 1" and that is all.
Also, the LV battery is not sealed FYI. It's just a normal lead acid battery with a directed exhaust port, but it is not sealed. There are caps on top you can open to fill the battery with. I cant believe Ford went with a non-sealed battery inside the vehicle. That is ridiculous and unsafe. They should have gone with AGM tech with internal hydrogen filters like Optima does.
Edited by SPL Tech, 18 January 2015 - 01:42 AM.