yeah i understand the battery can't keep charge longer than 4 day ady. me only weekend use, but normally my sibling use. But as long the car daily got use is ok de.If battery cannot crank after 4 days, the battery cannot keep charge already. About time to change. Mine was like that last time. Went overseas for 4 days cannot start, use everyday no problem. After change battery, 2 weeks no start, still can crank.
MF battery, you can tear away the top sticker, you will find filler holes. Unscrew caps like normal battery and fill, but usually once electrolyte dries up, battery already dying...