Runs on AA batteries and there is a traditional key option if the batteries die

I am now in need for 50 alarms.I am looking for an alarm that fits the following criteria: 1) 10 year battery (so tenants don't take it down when beeps for low battery, 2) Photoelectronic and not Ionization. 

The DCFC (DC Fast Charger) networks are owned by large, well-capitalized companies like EVgo, Electrify America, Tesla, etc.

That way you could make sure the plumbing fixtures aren't leaking, the air filters are changed and smoke alarm batteries are changed.

However, just like anywhere you are in the country, there are going to be some areas, that are simply not a favorable space (East Cleveland, Cleveland Proper (except: Tremont, Ohio City, University Circle, Gordon Square, Duck Island, Battery Park, Detroit Shoreway and a few more notable spaces)) moving on, the remaining eastern communities will give you settings featuring lower-middle-upper middle class, as well as premium upper class communities, but they do not seem to be on your radar anyway.

That doesn't mean that the tenant can terminate the lease without penalty though, as it appears you can continue to charge rent until you find another suitable tenant and then sue the tenant in small claims court for any amount of rent due that is not covered by their security deposit. 

The middle unit has smoke detectors without batteries.

@Andrew M.Well, you will definitely have to have all the smoke detectors to be hard-wired (with battery-backup)...and they need to be wired so that if one goes off upstairs, then the others go off as well. 

Instead of spending $50 on a new battery, I went ahead and bought the Dewalt impact/drill combo pack and couldn’t be happier.5) Water heaters can also be saved for a last minute turn on.

Runs on a 18V drill battery and you can knock out a lot of trim on a single charge.