I just installed one of these Ancel battery monitors on my bike. It is very tiny and connects to you phone via bluetooth. It will monitor your battery condition, temperature and state of charge as well do load tests when starting and also alternator tests. It is great if your bike sits during the winter. It also has settings for lithium batteries.
https://www.amazon.com/dp/B0BZ8D71NY?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
https://www.amazon.com/dp/B0BZ8D71NY?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1