Eq cycle length

A week date is a type of calendar which uses the year, week of the year, and day of the week to refer to to dates. In the ISO 8601 week date, the first week of the year is the week starting from Monday which contains January 4th. An ISO 8601 week date can thus have a different year number than the corresponding Gregorian date. The first week of the year is numbered 01 , and the first day of the week, Monday, is numbered 1 . Weeks are written in YYYY-Www-D or YYYYWwwD format, where the upper case W is literal. The corresponding strftime literals are %G-W%V-%u and %GW%V%u .

I have a D8 flooded lead acid battery 1400CCA and 255Ah capacity. it is 6 years old on a boat with a 3 stage 12 amp charger which is on all the time when the boat is not in use.
battery is now very low in specific Gravity 1175 less than 40% capacity. it’s voltage 3 days after a full charge is .  this is far too high and we suspected sulfation to possibly be the cause of the higher voltage.(we read this somewhere)
we then overcharged it at 16 volts and it only drew 3 amps . After about 17 hours the SG had gone up to above 1200 about a 50% charge. a remarkable improvement.
my question to you all is why is the battery voltage still high on open circuit and why is there only 3 amps of charge at 16volts. should we continue to overcharge it ?
Hugh

Eq cycle length

eq cycle length

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