Might be best to call or stop in a day or two in advance and have them put the batteries You've selected on a charger, allow them to charge for 24 hours, then, when testing draw out the surface charge before performing the test procedure.Remember to always have batteries load tested when you buy them. I have rejected a lot of batteries. At Rural King, they returned a whole pallet of batteries, because all failed the load test
By load testing how they sit on the shelf, you will know if they already are not worth having. Charging before you test when buying is like putting the burger under the heat lamp then checking if it is the right temperature. It might be 5 hour old burger that got to room temperature, but heating up before charging you won’t know. The parts store people are taught to always do it, so they don’t even know they are tricking you to buying one that has suffered a bit of damage.Might be best to call or stop in a day or two in advance and have them put the batteries You've selected on a charger, allow them to charge for 24 hours, then, when testing draw out the surface charge before performing the test procedure.
At least that's the way I remember that battery testing should be done. LOL
IMO the entire point of this thread is IF a (specific) AGM type of batteries deliver any "value" for their additional cost. In mild climates with decent charging normal flooded batteries can clearly last as posts like yours illustrate. Yeah, AGM is not worth it for the majority in normal use IF total lifespan is the ONLY concern. Cost of 2 flooded batteries vs. cost of one AGM... Well the AGM had better deliver more than 2x the life for the investment. You wouldn't get an opportunity or even have a need to replace OEM batteries.May have mentioned it before, the AC Delco batteries that came in my truck lasted for over 11 years, mileage was at 73,053.