That time spent left me no time to recharge my batteries, and more importantly spend time as the "visionary" to review and optimize my portfolio.

Only because the batteries dies out relatively fast.

I would not feel comfortable with tenants being responsible for anything more than basic maintenance (ie. filter change, replace thermostat batteries).

We also took other measures for security purposes - I ordered about six dummy video cameras that take a battery so a little red light constant blinks and No Trespassing Signs, Property Under Surveillance signs and installed them on and around the house on Day 1.  

1 hour to replace smoke detector batteries and light bulbs?

It should come with two batteries and a charger.

I've seen fake alarm systems which basically are stickers, SIGNS "(This Property is Under Video Surveillance" etc), and even flashing red lights that are battery powered-battery powered alarms - they have these at harbor freight, you can put on windows and doors- they're powered by magnets --Does anyone have recommendations for better battery powered or simple DIY alarm systems?

Well there are plenty of shared economy applications that allow you to earn extra cash off that battery powered ego machine(s).Really though, what if you tried to make a car sharing service into a investment model?

I replaced them with battery operated wireless switches.

Since that's dark, more light is preferable.I bought some LED light strips (3-4 lights each) that are battery-operated.