In the winter months I like to keep the battery in top shape by connecting it to a trickle charger. Obviously if you get to ride every day it’s not necessary but I tend to be too busy during the week so riding normally happens at the weekend. I’ve used a TC on all my bikes and it’s meant I’ve never had any probs with the batteries draining.
This is the one I use as it can also handle lithium batteries, which I had on another bike:
https://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/46459
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