Gutters, furnace filters, duct cleaning, dryer vents, detector batteries etc etc.

I changed to Schlage electronic keypad (great for nicer areas and vacation rental type houses as you can change code easily and instantly and give a code to your cleaners) but battery had to be replaced surprisingly early (about 1 year - supposed to last 3) Your application dictates which lock is best.

I have also done the cheap battery powered push button lights.

We need a viable battery storage system (Tesla?)

I took this weekend to recharge my batteries.

Batteries and battery acids are also common, dry cells and lead acid for larger models.

I finally quit being a criminal defense attorney after I represented a young man that was charged for the 8th time with Domestic Violence – Battery.

Maintain schedule devised by Landlord for light maintenance: Replace Smoke and C02 Batteries, Furnace Filters etc…If Smoke and C02 Alarms need actual replacing, it will be done by a licensed electrician.7.)

Fill in all holes with fire retardant caulkInstall ABC dry chemical fire extinguisher in all kitchensInstall battery smoke and carbon monoxide alarms in every apartment of sleeping areas and furnace roomInstall 110V interconnected smoke alarms in hallways and basement.

@Josh Dillingham downside is battery life.