I need to replace my original equipment house batteries (2 4ds) and am looking for advice on ways to avoid brute force/manual labor since these weigh 130 pounds each. A sailboat owner friend suggested rigging a block and tackle from the boom and dropping in the new (and retrieving the old)thru the port hatch just forward of the chart table. The geometry doesn't appear to work for this. I have an electric winch (Lewmar OP1 or OP2?) for raising the main and handling the mainsheet and was wondering if anyone has used their main halyard with this type of winch for handling heavy batteries. The new ones are likely AGM so can be tipped on end to fit thru the hatch. No sure what to do with the old wet cell 4Ds since they probably need to stay upright during off loading, but don't think they are quite as heavy. Has anyone used the main halyard/electric winch method?