Hogan773
Thread starter
It is in general, but many cars in the past 10 or 12 years have dedicated algorithms to minimize use of the alternator to increase fuel efficiency. In addition they vary the charging voltage while in use. That in itself does not negate use of AGMs, but some manufacturers optimize that algorithm to a specific battery type whether flooded, EP or AGM. Some owners have thrown in whatever battery is available and it works out fine. Some say it doesn't work out and end up with shorter battery life. Others regardless, take the safer approach and only use the battery type that came with the car originally.
From a quick search, a 2014 Honda Accord does not have any specialized charging algorithm so an AGM should work fine. I have used AGMs on a 1978 Ferrari, a 1997 Ferrari, 2001 BMW, and many other cars (including several more recent Toyotas, Honda and an Acura) without issue. None came with an AGM from the factory.
Always best to check your owners manual and a trusted service provider.
What I have read is that the charging voltage coming from the 2014 Accord is a little lower than ideal for AGM (AGM prefers to be charged around 14.6-14.8V from what I can see, while the Accord is putting out 14.3-14.4. Maybe doesn't really matter, maybe does. For the price difference (premium for AGM) I didn't want to risk having the lack of proper charging basically mean the battery never gets properly charged, affecting its life. Maybe they can still get fully charged with 14.3-14.4 and what I'm reading is overly conservative but I don't know for sure