I also have an abundance of detectors of both types, and I hardwired them so no lapses from forgetting to change batteries.

You CAN spend even more money and get battery backup with this mode... so if the power goes out you can have a small amount of energy to run things other than the HVAC or stove... like a medical device.

Emergency Contacts and Guidelines If something needs to be repaired or replaced:Please contact xxxx, LLC by sending a text message to xxxx at 303-xxx-xxxx.If you do not receive a timely response, please also try 303-xxx-xxxx.Fire, medical, or police emergency:If it is an emergency call 911.Please replace batteries in smoke and carbon monoxide detectors as needed and leave them and the fire extinguisher(s) in place.

Are there notable benefits to going with the wired option, besides not having to recharge the internal battery every X number of weeks or months?

Rules are good, just make them standard ones that other good landlords are doing.An example of what not to do: don't say you're going to do quarterly inspections (only do inspections every 6 months max and just say it's to change smoke detector batteries and check to see if there are any plumbing leaks and you're in and out in 5 minutes). 

We used the excuse of changing smoke detector batteries and a quick look under sinks to be sure they weren't leaking, a listen to the toilet to see if it's running, ask them if they are having any issues and then we were out of there. 

Fuel with 4amp/hr battery will last longer than the sears impact driver itself.

If you start doing things like this, you’ll be receiving calls for a plugged toilet, replacing batteries at 3 am in a smoke alarm, a noisy neighbor, etc.

Remember to have your cell phone handy when he shows up, alone, and have your friend there to take pictures as you shove and swear at him, who does not have a witness, in order to provoke your landlord into reacting violently against you in any way that touches your person so you can call the Police and have him arrested for Battery.

We gave 48 hours notice at least and said it was to test the smoke detector batteries and look for any plumbing leaks.This was in a building with 26 units.