Odyssey publishes a list of approved chargers. The trickle charger in question is on that approved list in the trickle charger section. According to the instructions that accompany the charger, it can be left on at all times.
The term trickle charger is for one that never shuts all the way down and has any constant charge rate. Over the years as a mechanic have seen them ruin many a battery most lead acid.
Maintainers do not over charge like the trickle ones do as have seen when the wrong one used, trickle, boil the battery dry. I use Battery Tender brand and have about eight of them in use during the winter and a few all year round.
Having been a mechanic all my life close to 59yrs know what works and what does not. One I would not use due to problems with them is the Harbor Freight one. The new types of batterys out there only use what the mfg says is right never just use what Joe next door says works.
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