Niko,
Good batteries should last you more than 2 years, more like 3-5. You can usually see the battery bulging when the plates start failing, then it is a no brainer. You can give them a load test. If they remained trickle charged thru the winter they should be fine.
Lots of literature out about the new gas....the latest theory is near MT tanks for the winter with E10 gas, some kind of stailizer wouldn't be bad either for the small amount of gas remaining. I have read that a product called Startron from Starbrite is good for the water/gas interface which is more of a problem no a days.
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