In the last few years I have purchased a couple of devices to make life aboard somewhat easier including a right angle drill we use as an "Electric Winch
Handle" and an electric
inflater for our dinghy
. The "Winch Handle" uses 18 volt rechargeable batteries while we power the inflater with a rechargeable sealed 16 amp hour 12 volt battery
As we may go quite some time between needing these items I'm wondering what is the best way to preserve the batteries. In past I have fully charged them and then stored them in a cool dry spot. When we do plan to use them, I put them back on the chargers to "top them up". Unfortunately, however, I have found the life-span of the batteries to be quite a bit less than I had expected and I'm wondering if my storage
regime is faulty or if they need be "exercised" more often or what.
I will appreciate any suggestions by any one of the electrical
wizards on the board!