There is only clear liquid covering the plates. Charger only has a 6 Volt Manual Setting. Just from an observation, there doesn't appear to be any reason for the loss of liquid. I did put some distilled water in all the batteries since they have been on SP since late February(last used). But, this is the only one which lossed liquid. Sure made a mess in the battery compartment. while I had the batteries out during cleaning, I checked the electrolyte in all 4 batteries with a hydrometer. This particular battery did show a low reading. I could add some electrolyte to the cells and see what happens, but I'm not sure of how much to add. Any thoughts?