I have a new Walmart 27-series deep cycle battery, maybe 2 months old and working fine. I charge it religiously immediately after every trip with my 2/10/30 amp smartcharger.

I installed a small voltmeter in my battery box to help me keep a closer eye on the remaining charge. I've noticed that after the charger says it is "full" and stops charging the voltmeter reports 13.0 volts. Is that the right termination voltage for a new battery or should it be a little higher? I understand about surface charge but still thought it should be higher.