One of the publications i linked to was published in 1975. How old are they?
Sadly, that's not relevant if they haven't been regularly given a top up charge- even gel batteries become toast without maintenance. It might be worth trying to find somebody with a good battery charger with a desulphation mode, otherwise they're worth what a scrapyard will give you.As I said, never used.
Sadly, that's not relevant if they haven't been regularly given a top up charge- even gel batteries become toast without maintenance. It might be worth trying to find somebody with a good battery charger with a desulphation mode, otherwise they're worth what a scrapyard will give you.
Theoretically not; depends on storage.They still degrade chemically with time- here's hoping they're still in good order.