Jim, you have exactly the same problem with balancing the batteries in a 12 volt vehicle. But the closer the batteries are to being in balance to start with, the less of a problem it is. Which is why should always replace the batteries in pairs. Charging the new batteries individually (or better yet, in parallel) helps to ensure they are in balance.
As I mentioned in my first post, most battery chargers have no real voltage regulation. Consequently a battery in an unbalanced pair can be over-charged much more by a charger than by a vehicle's charging system.
If you want to prove this, just run a six volt accessory off one of your vehicle's batteries. It won't take very long before that battery is discharged and the other battery is overcharged.
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