Costco has Battery Tender – Battery 6/12 volt Charger / Maintainer 3A for $27!!! Different varieties of Battery Tenders are sold online: https://amzn.to/2MKTb3c .
I typically either disconnect my car battery on the cars i dont drive very often. however with more cars relying on power door locks and hidden driver keys. It may be easier to just keep the car battery charged every 2 weeks of none use.
I use these to keep my other cars which are parked for a long period of time. For my Honda Accord and Dodge Cargo Van, I connect the leave the 3 amp Battery Tender on over the weekend and swap cars every week. This keeps the cars 12 volt battery from failing and the cars are ready to drive if needed.
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