Let them charge over night then the next day take them off charge - wait 30 minutes and check the voltage with your multi meter (at the battery).
Full charge (but normally quoted at like 75 deg temps - will be lower if its cold outside) is usually between 12.7 and 12.8 on most batteries, 12.4 - 12.6 is 75 %, 12.2 - 12.3 is 50% and 11.8 or less is dead. (I gave you wide ranges to cover LA, AGM, Gel).
When I tested my 9 mo old OEM battieries they would drop immediately to 9.7 - 9.8 = super dead ever commming back to life.
So if your batteries are at like 75% or above, check a few hours later and see if they continue to drop and then the next day as well. If they stat at like 75% + charge I will milk them for longer but keep your eye on them and shop around for replacements (IMO). IF they are at 50% just replace them right away.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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