Hi friends,

I need to use a 12V SLAB for backup purposes in a design. Normally this
design is powered but on very rare cases power can be out for 1 hour max
during which the slab should supply power. It can take months between these
power outages. I need s simple (hopefully) circuit to keep the slab fully
charged. With the long time between outages fast charging is not  needed its
OK if its take a week to charge the battery again after a power outage.

How would the ***simplest possible*** working charger for a scenario like
this look like?  I have 12V regulated. I have a PIC so I can measure current
and voltage and temperature and do PWM. I also have some space left for a
charger....  Ideas?

Cheers
/Ake
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