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The battery rating is from fully charged voltage to fully discharged voltage so it will drop as you discharge the battery.
The relation between charge and output voltage is different for each battery type
Does it mean that :
Initially a fully charged battery is 12.6V, after usage, voltage drops gradually, when the current drawn is abut 16 AH (in this case), the terminal voltage of the battery is about 10.5 V.
Am I right in understanding that!