It depends on the language in the policy, but I wouldn't be surprised if the policy excludes coverage for criminal acts - like assault and battery, which this appears to be.

Keep a stock of double A batteries so guests or housekeepers can replace them as keypad locks seem to use a lot of power.  

I like to use the manual deadbolt option (meaning guests enter the code and have to turn deadbolt) as the battery last much longer with that setup. 

Schedule a time to change the smoke detector batteries/ HVAC filter and walk through the property to see if someone else has moved in.

Smoke detectors must have a nonremovable battery that can last 10 years.I have not seen a 9v battery that has an expiration date as far as 2023.This also requires that the 9v battery be soldered in.

Things I have come across that can lead to saving money, time, and headaches:-Smoke detectors with long-lasting battery-Low-pile and stain resistant carpet-Heavy-duty tile w/ lifetime guarantee -Long-lasting light fixtures and bulbs-High-gloss paint (easier to remove stains)I am curious to hear others weigh in on these practices and provide others.

You will see that $4200/year in increase will not be enough to put you in the black for as much as 2 years if the reconditioning and vacancy costs are anywhere near my expectation.Yes, eventually you are going to have to face this $7000+ hurdle, but if you are cash flowing now, I would recommend a $50 rent increase this year ($1,200 / year) and another $50 rent increase next year as well.

There are extra battery backup packs and use motion sensors so they don't run 24/7, the power will last for more than a year.

We had our house burn  down   a total loss  due to a remote control  traxxas  battery charger within 30 minutes whole  house suffered  smoke and water damage happened  about  a year and a half  ago thank God no one was home and it happened in the day time.  

Simple question, who is responsible for the upkeep of the batteries of smoke alarms?