Platinum-grade batteries with a three-year warranty, brake pads guaranteed for life, windshield wipers changed every year, Michelin tires changed every 2 years, oil changed every 5000 miles.

I’ve also had scenarios where one battery died and it was advantageous to have a second phone with my contacts.

Had multiple excuses why late including the truck had a dead battery and pouring rain.

I get around them by disconnecting and re-connecting the battery to clear the codes and reset the light. 

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Replacing batteries is a big cost.

We used the excuse of changing smoke detector batteries and a quick look under sinks to be sure they weren't leaking, a listen to the toilet to see if it's running, ask them if they are having any issues and then we were out of there. 

Provide a safe and clean space for tenants, take pics when you install (every 10 years) or change batteries on smoke/carbon detectors, have them sign off on a movein doc that says windows open, smoke detectors, test.

I mostly blame my naiveness in humanity and eagerness to get the project going.. here are many of the items (not all):All 3 HVAC units went out in the first 3 monthsBoth "high end" endless water heaters died within 6 monthsThe 1918  LEAD pipe entering the home burstSome lighting was found to be battery operated instead of electricUnfortunately a rock from DC water entered the piping which resulted in multiple cancelations and major repairsNo insulation between the upper and lower unit resulting in numerous noise complaintsPitch incorrect in back yard which results in floodingPlumbing piping incorrectly sized throughout homeAll gas lines removed and everything replaced with electric to pass city inspection easier (only house on the st without gas)Oh yeah, furnishing a two units that can sleep a total of 16 people is not easy nor cheap (especially with a puppy).

I want one with a battery pack or solar panel that runs on cellular (not WiFi) and has two way communication.