Water battery last longer then MF.

MF is just for auntie or people who are too lazy.

MF battery inside also got water, just the top sealed so to let the auntie know that NO NEED MAINTAINANCE (until u cannot start, then buy new one).

You can make your own MF battery also, just buy a wet cell battery (cheaper) and seal off the top. When it died, just open the top, refill water, and re-charge it. If u lucky, still can use another year or two.

Is there any MF battery that is not entirely in a black case (which u cannot see inside?) how come they make all MF in a black casing ? Its for you to ponder, auntie.....