> Jinx, may I ask how you keep the SLA charged in this circuit ?

Yes. Yes you may

> A small typo ? (1k comes from unreg. ?)

The jacked-up regulator - diodes + resistor provides a float charge for
a battery that has been fully charged before installation. I found there
were conflicting opinions from "experts" about the requirements of a
float charge. That float charging is not desirable for long periods, or
that float charging is acceptable if less than 1A, or that the lower the
better. I opted for the last and monitored the battery for a couple of
years at the bi-annual daylight saving adjustments. So far they seem
healthy enough, and are capable of discharging well into a 1A load.
As far as I know only one has been called upon to do any actual work,
which it did, and that was for just a few hours last year

However, I'm always open to any suggestions for improvement

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