No electric to run, these run on regular batteries.

I do mine quarterly, there is a lot that can change in 3 months, batteries in smoke detectors, leaks under sinks, furnace filters, roofs, cellars you name it.

I also found that the daughter has several felony convictions (damage to property and battery) and that the parents are having their wages garnished in the amount of $45,000.

The smoke detectors in the units were all battery operated.

Or are some landlords just cheap and opt to go with battery smoke detectors notwithstanding the law? 

Our inspection uncovered that the smoke detectors were battery powered.

doors - if outside doors=350 a door or inside doors=125 (or the cheapie 35) per door no labor.washer/dryer - just the electric cables 20 each no laborkitchen outlets - just GFI is 20 each. no laborpaint/knobs - 1.50 each knob. no laborfaucet - decent one 80-150. no laborplastic lining - no ideadetectors - either batteries or new detector at 10 to 49 eachgarage door - 1 hour labor cost for Atlantaoutside cleaning - 300 to 500 for cleaning.Do not misunderstand me, you can get the job done by yourself cheaper, but hiring two guys and the cost of materials is surprise.

And batteries, last for 1 year, 5 years?...

Junk yards typically have battery acid leaks, motor oil leaks, gasoline spills and other items relating to electronics.

LIFE-CHANGING ACTIONS here.STEP 1-20.You need to get you personal home rent-ready... not overboard updating, just rentable... clean and painted etc.Fix any leak faucets, loose doorknobs etc NOW, so that when your PERFECT tenant moves in, they won't be calling you to fix those.Put in new 5 Year Lithium Battery (write the date installed ON THE OUTER SHELL) of SMOKE DETECTORS (draw faint red stripes across the front outer shell of smoke detectors-- red means fire or smoke-- when the smoke clears (if the house didn't burn down) it's ok to reset the smoke detector and finish cooking dinner.ON CO DETECTORS (draw faint gray stripes across the front outer shell of a CO--teach your tenant the gray stripes mean DEATH-- if that alarm EVER starts beeping, they are to immediately raise windows , open doors and call you---even if its 2am--- A REPAIR MUST BE MADE or people can DIE-- little children and elderly go first