Float chargers are attached to the 12v in the generator, and also to
two 12v that provide back-up for the sump-pump. Neither of these
units is used every day; in fact, the sump-pump batteries have never
been used in seven yrs. So, presumably, the chargers main function in
these applications is to keep the 12v from discharging due to lack of
use.

But beyond that, do chargers, theoretically, keep batteries ready and
able to run indefinitely? Or will the cells eventually die of old age
despite the chargers, much like a well-preserved, fit old person: Bob
Hope, Geo. Burns, Jack LaLanne?