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You have removable caps.
Take a specific gravity reading with the above hydrometer on all 6 cells.
Make sure no bubbles are sticking to the float.
Are they all 1.265 or higher and within 0.010 of each other?
Let the charger go through another cycle.. recheck specific gravity. did it improve?
New batteries, and especially those which have sat on a shelf and self discharged for a few, to several months, can behave outside expectations when first put into service, but far more noticeably if that service is deep cycle duty as opposed to the relatively easy task of starting a fuel injected engine in summertime.
I would not put any weight into whatever electrical gizmo decides to declare, until the battery has seen some level of discharge to 80% or less and been promptly and hopefully fully recharged, or nearly so, and allowed to cool off to ambient in the 77f range or below.
turn on the headlights for a half hour and immediately put on the 'smart' charger at 6+ amps over night and dip the cells the next AM.
If one were trying to make a battery live as long as it truly could, knowing the the true maximum specific gravity when new is wise, so on subsequent recharges, one can judge just how well their charger is doing.
Often one will find that their 'smart' charger needs to be restarted over and over to attain that previously established maximum temperature compensated specific gravity.
It will vary among different batteries and often, among the same cells of the same battery, if one bothers to actually take and record the data.
But of course batteries are only rented, and such efforts, even on an anal retentive site like Bitog, that stresses PPM of boron and moly in their 5w-30, are often dismissed as a waste of time.
A 'new' battery that has sat and self discharged for months will often need a deeper cycle and extended recharge cycle, perhaps to higher than usually recommended voltages, for specific gravity to max out, and without such care, will lose performance and capacity faster than it otherwise would.
The temperature compensating Hydrometer is the flooded battery polygraph. it will show when a battery is truly fully charged, but it will not reveal the remaining capacity, as compared to when new, healthy, and fully charged.
New, but shelf aged Lead acid batteries can often give excellent service, but the chances of excellent longevity increase substantially when the specific gravity maximum has been achieved/established early on it its usage.
Most never bother until the battery is on its last legs anyway and will not benefit from such care.
But ignorance is indeed blissful, and one can hope for failure within the warranty period.