I have a flashlight and a lifetime supply of AA batteries, I'm ready!

He charged us $85 at one time to change batteries in 4 smoke detectors.

The other smoke detector was said to not have a battery and taken off and left on the table. 

It's very unlikely a tenant is going to buy a solar system and a Powerwall (plus it sounds like they'd actually need more than one Powerwall or even a Powerpack with extra EV chargers since you mentioned they have more than one EV, a single Powerwall wouldn't be enough in a situation like that).

It's also acceptable to hold tenants accountable for consumables like light bulbs, smoke detector batteries, or filters in the refrigerator.

The other 20% is a grab bag of people that don't need to use ALL rental income to qualify (so the one unit appearing on tax returns does the trick), people that move back in with mom who doesn't charge rent, wonky things like that. 

They also have a parking spot that is included with no extra charge. Rent

Since AL and the other review sites are a marketing expense, you should expect that most of the companies advertising there charge rates that take that expense into account. 

+1 to the person above who mentioned recharging the batteries after an event.

Just be sure you change the batteries annually.