Highly recommend the CTEK chargers - they are intelligent so will monitor the battery and condition it where needed, just leave it plugged in. I use it on my MX5 during the winter when it has less use and have the quick connect thing so it takes 5 seconds to connect it & don't need to touch the battery itself.
https://www.ctek.com/products/vehicle/mxs-3-8
https://www.ctek.com/products/vehicle/mxs-3-8