RW Salnick wrote:

Skip Gundlach brought forth on stone tablets:
[snip]

Our systems continue to function well, though we found that
perhaps our batteries are on their last amps, or, maybe it's the
belt.

I don't know what kind of batteries these are - if they are common
lead acid batteries have you checked the level of fluid? Do they need
to be de-sulphanated?