first things that come to mind are to check the voltage of the batteries.
second i would ask the person you are getting them from, how have they been stored? Were the batteries stored properly and charged up when needed? How much water is in the batteries?
are the batteries bulging?
Living off-grid 23 acre farm, with goats, chickens, pigs and a huge bodacious garden
-USDA Zone 8-9
if they are 6 volt deepcycle wet batteries then they are most likely good. They probably wont last as long as they could have but water them, then give them 3 or 4 charged to 50 percent discharged cycles and they should bounce back. If not still worth $15 a core...
Good find! David
What a find! Are these SLA or “wet” type of batteries? SLA batteries are virtually free of maintenance. “Wet” batteries are almost maintenance free. In either case, lead based batteries have a pretty good lifespan.
I say go for it and again, congrats on the great find!
If they are the big heavy 6v batteries, they are most likely Golf Cart batteries. I have several in my solar setup, if you run them in sets of two. -+-+ That's in series, and it makes 12v per pair. Then run the pairs in parallel ++/-- for added capacity at 12v. Most deep cycle golf cart batteries will last in excess of 10 years in use. If not abused.
Be Content. And work for more time, not money. Money is inconsequential.
What kind of battery charger are you planning to use? Some have a desulphate/recondition mode, it's quite a technical thing but they more or less 'shock' the internal plating to get settled yuk off them, this way you can squeeze some extra life out of old and neglected batteries.
if they were stored in the basement of a hardware store they may not have any electrolyte in them yet. Be sure to check that before you charge. They would be like new if they were stored dry. That would truly be a great score!
What capacity do they have? Have you tested them yet?
This brings up a subject for another thread about batteries and Permaculture. They are expensive but what about stashing extra dry batteries for the future?. People store food, water, fuel, gold, wine, silver, cheese, medicine,.....why not dry batteries? I imagine a few Prepper’s are storing some in their bug out kit.