batteries
I've kept a boat anchored for well over a month; it was essentially a temporary mooring. I am a fan of using only one anchor, to allow the boat to properly swing with the elements while minimizing the risk of fouling any of the tackle. Either a storm-sized CQR (preferrably) or fisherman well-set to the prevailing winds or to the direction of the winds that would pose the greatest threat are best. Given plenty of chain to drag around, those two anchors accomodate the shifts best. Considering the batteries, as it were, I did not run a light at night because I had no way to turn the light on. So KENNYH, please post a link or the brand name of the automatic anchor lights you mentioned. Also important are working bilge pumps, with their own battery to draw from. I've found one starting battery can sustain a bilge pump for a long time, longer than I even calculated it to. As far as choosing that bilge pump, use the one that uses the least amount of power to pump a given amount of water. Obviously larger capacity pumps will not run for as long, and smaller pumps draw less current; up to some length of time, the large pump unnecessarily uses too much power, after which the smaller pump eventually drains the battery without draining the bilge. For a week's time, this isn't a huge consideration but nonetheless good practice.