Greetings
I found the last time i bought a new Yuasa it went to something like 12.4 volts with just letting it settle after filling it with acid (i trickle charged after that)
If you are in any doubt get it load tested or you might be able to set a voltmeter up at the battery terminals and do some crank/start tests to see how it is performing.
Don't forget to check the plug and socket at your 30 amp fuse take off at the battery positive for corrosion or signs of over heating.
