No battery. 

So, go with a good solution on the deadbolt.Screw a lockbox in a wall near the door for an emergency physical key.Find a locksmith that can rekey the doors between tenants - put ALL locks on the same key.Most electronic locks warn you when the battery is getting low.

Their academy modules and webinars are super helpful as well.

Try to anticipate other potential avoidable situations with a follow up inspection to assess the Locksmith’s work and ask your tenant(s) if you can also use the time to assess for other issues such as unchanged HVAC filters, leaky pipes, working shutoff valves, working smoke detector batteries, properly working downspouts, clogged dryer vents, evidence of water damage from leaking roof, etc,etc,etc.

Quote from @Eduardo Perez-Borroto: Since the HELOC was not used on improving the home you cannot deduct the interest, nor use that to offset your capital gain.Would adding a battery bank system to my solar panels count as home improvement? 

When I quote people for projects, I'll use ChatGPT, I have a module I spent hours on pricing jobs correctly in NY.

the electronic keypad locks so don't have to deal with keysbut keep in mind batteries need to be changed like once a year

The parts are fairly cheap and they are on the easier end of things to install but you may not wish to do this.On the burners there is a device that looks like a rectangular box called a spark module and it generates a spark to light the burners.

Module #1:  Establish an investment, where the income from it pays for 3 things.  

I have a remote key but when the battery dies then what??