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I have 3 x 12v batteries that don't get used much over the winter and I'd like for them to not die!
Any recommendations for a charger/conditioner that I can attach to a battery and leave it to it?
IIRC, the weapon of choice for laid-up-over-winter motorbike batteries was a thing called an Optimate. I think.
I use a Ctek charger/conditioner on my kit car. Since using it I've not had to replace the battery, before I did.
[url= http://www.ctek.com/gb/en ]Ctek[/url]
My optimate's now very, very old but does the job brilliantly, with a bit of patience it's brought a few dead batteries back to life too. The motorbike has a 12V takeoff so I could just plug it in without fannying about with croc clips, well worth the addition. It's very slow to charge a flat car battery though, even at full charge it's still basically a tricklecharger.
+1 for CTEK (MXS 5.0).
Presumably you're talking about lead acid ?