Well, I am an electrical engineer that builds batteries for electric vehicles.  

They work like a charm and battery operated.

I once had a brand new car that kept draining batteries.  

Do you think the pols in Sacramento won't see this housing boom as a way to fund their pet projects - solar, sanctuary city, Battery Vehicles etc etc you name it?

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.

Batteries and Pharmaceuticals are great examples.Looking at the flow of shipping containers, it's going to be a while until China will be able to get back into the bulk export business, even if they magically get their workers back to work.

They can get battery operated wifi cameras for a reasonable cost.

Regarding battery replacement, Nissan has been replacing Leaf batteries in the $5000 range, not $40,000.

I have had my MacBook Air for 5 years, and just literally replaced the battery, 2 weeks ago.

Flush all the toilets.Check all the outlets and make sure the plugs stay in and that the outlets are functional (note any switched outlets)Test the smoke detectorsReplace batteries in digital thermostatsMake sure all light fixtures are working (we replace bulbs with leds).Make sure there are thresholds and not rough flooring edges.Make sure the HVAC system is functional.At your move-in walk through: show your tenant where the breaker box is and how to reset a tripped breaker.If you have old triple track or double track storms, show the tenants how to operate them.Show tenants how to relight the stove pilot light.Test the smoke detector in the tenants presence and show them how to replace battery if not a sealed unit.Show the tenant how to operate the thermostat.Remind the tenant to use the bath fan or to open the bath vent window.