Bunkermagnet
Journeyman Pro
I have a Ctek one, and have the battery connection lead permanently bolted to the battery terminals. A simple and no-spark connector at the other endand putting the battery on a trickle charger
eg https://www.halfords.com/motoring/battery-maintenance/battery-chargers/halfords-6v/12v-maintenance-charger-329091.html
or https://www.halfords.com/motoring/b...vanced-smart-battery-charger-plus-238350.html
NB I'm told you need to drive at least 20 miles to recover from the starting usage