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Scott, sorry about your Shorai troubles - hope it's just a connection issue. From personal experience and anecdotal stories, I would never leave a lithium battery on a battery tender or charger full time. Lithium batteries, whether they be in phones or for powersports vehicles, do not like to sit at 100% for any significant length of time. I charge mine one day per week for 18 hours on a timer. And frankly, I like the Deltran Battery Tender Plus better than Shorai's own charger for the 5 Shorai batteries I have owned, which have all exceeded 4 years of service.