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I have a Citan which is based on the Kangoo. Very often doesn't get driven for a couple of months. I've had to recharge the battery a few times in 10 years. Before you try and start it if it's been sitting, make sure you switch off the ac/heating, radio, lights etc.
You can get a small portable battery pack that will start it from pretty much a dead battery, at least while the battery pack is relatively fresh (under 5 years old).
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If you can get a battery conditioner continually plugged in where it's parked then that's the best solution otherwise taking a portable jump pack that's fully charged is probably the best option. 6-8 weeks isn't a killer I'd say, but unplugging the battery is a pain in my opinion so I wouldn't do that.
So, I’ve got a Kangoo mk1 (fits all the bikes!) for the occasional trips to the mountains, but it won’t be used much. It will mostly be sitting in an underground car park, and I worry about what will happen when I come to pick it up every ~6-8 weeks. Notably, to the battery and the tyres. Might get a bit cold this close to the Alps.
I’ve seen battery chargers, jump starters, folks who recommend to unplug the battery… but I’m very non-knowledgeable about cars and unsure what I should do. What would you all recommend?