For long term storage where 120vac is usually there (Assuming no power fails) I recommend a Battery MinDer or Battery Tender type product. There are several makes and brands .. I group them in two groups.. Basic (Which I use all the time) and PLUS (which I have in my rig's storage compartment just now. NOT conencted)
The basic type is 2-stage charger (Absorption/float) it uses a fairly high voltage till it senses "Full up" then it switches to float mode
The PLUS type is a 3-stage.. Absorption, Float and De-Sulfate/Equalize, which it's proponents claim will actually re-vitalize a battery that is starting to loose some of its edge... I do not know if this is true or not.
The reason there is no "Bulk" mode (normally the 1st of 3 stages) is .. These units are usually 1-4 amps max.. Not really a "Bulk" charge rate (which on my coach is 70-80 amps)
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
Beware of phantom circuits draining batteries, one that is common is co2 detector. If it is not wire to the fuse panel, but direct wired to batteries with an inline fuse (automtive type). Look for a small guage wire (18-22 ga.) connected to the positive terminal of one of the batteries, follow that wire and pull fuse out for storing. Most everything else would be disconnected with installation of the battery disconnect switch installed in the "common" (negative).Another is power to radio/stereo system which has remote control feature, although these are normally fused in fuse panel and would be dead with a disconnect switch.
Best for long storage, lift cables off batteries, and they will hold fine for quite awhile.
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