He charged us $85 at one time to change batteries in 4 smoke detectors.

The other smoke detector was said to not have a battery and taken off and left on the table. 

It's also acceptable to hold tenants accountable for consumables like light bulbs, smoke detector batteries, or filters in the refrigerator.

Features:3/2 with flex room (4th bedroom possible with frame out closet in large flex room)Large open concept living/kitchenNew roof (architectural shingles, 2017)A/C 7 years old (manufactured 2010)Front and back wooden deckSmall neighborhood, 7 minutes to uptownAcross the street from Elementary SchoolVaulted CeilingsOriginal Hardwoods in living areas and hallwaysFenced in yardStainless steel range and dishwasherWHAT IT NEEDSMaster bath remodel (there is a very accessibly crawl space, so this should be easy according to the contractors I've spoken with)Reconditioning of hardwoodsNew CarpetPaintRefrigeratorNew interior doorsMinor landscaping (one tree removal)ARV: $220,000Repairs: $20,000LIST: $175,000 What made you interested in investing in this type of deal?

Changed out joulsey windows, updated electrical, reconditioned storage structure in back of property.

+1 to the person above who mentioned recharging the batteries after an event.

Just be sure you change the batteries annually.

currently needing to upgrade a new property of mine and am stuck trying to figure out which would be my best option to go with: Combination CO2 & Smoke alarms that are 10yr sealed or just plain jane battery operated.

I tell them to change the batteries when i send them the lease renewal or else theyll get locked out. seems to work well so far.

Hardwood is great for rentals because of the durability so I'd sand/re-condition the existing floor (if it's in decent shape).