A previous owner added 2 batteries - total of 4 - to my 1988 Catalina 34. Two starter batteries, in parallel, have been added in the Lazerette, and two house batteries, in parallel, are located in the battery compartment under the forward salon table seat. The wiring runs are somewhat confusing, but seem to work well enough. I am wondering if the added capacity is worth the loss of storage in the lazerette - not to mention the added weight in the stern. I am considering going back to the original design, and keeping it all very simple. Are two 27 series batteries (1 house and 1 starter) sufficient for everything onboard?(wondering why the change was made in the first place). Any thoughts or opinions will be appreciated.