They were a blessing that saved the project and they continue to be what I think about to cheer myself up when I'm blue.My remodel investment was as follows:Property: purchase price + interest, taxes, escrow, whatever = $25,910Other Carrying costs: water = $241Demo & Hauling: $580 (Craigslist Find)Water Main and Hookup: $1,890Septic and Leech field: $4,250Concrete, Framing & Roof: $17,406DIY Exterior Paint: $470Plumbing: $5,953DIY Solar System & Batteries: $14,181Electric Wiring & Lighting: $880 (Husband is an electrician)Mini-split Heat Pump $2,000Insulation, Drywall, Primer: Plus "shiplap" style wall to cover fed up drywall - $4,489Floors: $3,327Interior Paint & Trim: $520Tile: $5,129Kitchen cabinets, shelves, countertop, sink, etc: $2,483Appliances: (range, hood, fridge, dishwasher, washer & dryer) $1,679Bathroom: (bath, shower, vanity, trim, etc) $1,448Fence and Patio Cover: $3,900"Landscaping": (gravel, shower, tiles, lights, etc) $1,048Furnishing: $1,518Housewares & Decorating: (many from my house as we were moving) $150It took over a year to finish since I ignored it the first 6 months and could only do the occasional weekends once I got started. 

They are usually responsible for anything consumable like light bulbs, smoke detector batteries, filters, etc.

How long do the batteries last in a harsh climate? 

It turns out the camera was not functional...just one of those that look real with the battery powered led light.

(ending the need to take them down).Also they expire in 10 years (there should be a date label on them), and if you want, you can get 10 year no battery replacement models.Good Luck!

I would pay the PM a quarterly fee to do this  @James Wise   We offer a unit inspection with a change of the batteries, filters etc to investors as many or as few times as they would like.

Replace batteries in smoke alarm.

There may be a battery backup so it could make noise even after you disconnect the power (but 15 years is pretty old for it to still work).

Z Wave uses much less energy for the wireless signal so the batteries in the lock last much longer.

Although I don't know if what you have now is just battery operated or hard wired, that makes a difference.