My wife has this Deuce which she has not ridden for several years. I have been taking it out once in a while to warm everything up and it has been on a Battery Tender. She wants to get back into riding so we want to get it up to snuff. Will be replacing tires(age), doing full service including brake fluid change and putting in a new battery. I am leaning towards Lithium but do not know the best brand/brands. Have done a google but came here for expertise. It will be ridden only occasionally.

What are my best choices?

Thanks

paul