Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 23Get this manual
Out-of-Season Battery Storage 1Remove battery as soon as possible and remove
all grease, sulfate and dirt from top surface2Cover PLATES with distilled water, but not over
316 in(5mm) above perforated baffles3Cover terminal bolts well with grease4Store battery in COOL, DRY place in dry car-