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remery said..
Funny you should say that, I started the cars and bikes today in preparation for my absence. I need more trickle chargers.
You need battery isolators. I have gone away for months and left one of the cars at the airport with the battery isolated. Its a bit of a theft prevention too, not that its easy to get a car these days without the key. The van started up straight away, which is unsurprising.
One time I forgot to isolate the battery and came back to a flat battery, but at least the airport has a service to jump start your car.
Just for the sake of it, I changed out my motorbike battery for a lithium one, just because they self discharge a lot less than the lead battery. Its surprising how long they can go for without having to top it up whereas the lead acid batteries need a bit of a trickle charge to keep them healthy.