Without knowing the size specs of the house, I can make an educated guess knowing the community you are referencing, and I think your rental estimate is high (possibly by as much as $2-300).

First let me say this- if it is more than replacing light bulbs, batteries and filters I don't let tenants touch anything.

Then a guy popes out of their unit and says to my tenants "Thanks for the battery bro".

I used to be an onsite manager less than 6 months ago in CA so that would be my feedback.the other stuff is not that important, it won't net much gain in rents.your annual maintenance is critical on each unit  - caulking, changing flappers and batteries on smoke detectors, co detectors and changing air filters.

If I in fact remove that tenant's hand upon being 3 days late (with their willingly given permission).... a signed document allowing me to do so would not prevent a charge of battery levied by law enforcement.No Lease Agreement can supersede Federal or State law.

My main complaint with some section 8 tenants is they are generally a little more needy with things like changing light bulbs, batteries in smoke detectors, changing filters, and other small maintenance items. 

Keep all units the same, easy to handle with one spec for all. 

The only thing I allow my tenants to do is change out the smoke detector battery and the indoor air filter.If pay the repair yourself, just keep a record of what was done and if it happens again in the near future then definitely do a tenant charge because that would be in excess of normal wear and tear.I hope that helps and good luck in your decision! 

Try changing the batteries

If you keep the property up, and do inspections every 6 months, change smoke detector batteries, meet codes, etc., I can't imagine anyone having a multi-million dollar successful suit against you.