https://www.amazon.ca/NOCO-GENIUS1-F...biblesospca-20
I use one of these ones to top up a battery of a vehicle that's been parked for a few months. I'm very happy with it. My parents also do stupidly short trips in their vehicle (multiple trips less than 5 mins in duration multiple times a day), so I'll use this to top up their battery before a cold snap in the winter.