It's hard to determine what makes you tick before you identify where to insert the batteries ;)

I've used a dog tracker -- a wireless, battery operated GPS devise which sends me a text message when the 'dog' stove, or whatever runs away.  

Two, in a power failure a traditional landline (not VOIP) will still be operational since the telco uses batteries.

When I encourage people in any way it recharges my positive mindset batteries!!!!!!!

It has a built in battery backup, so you are covered for short periods of power outage or thieves unplugging it.

Up until then, we'd been running battery-powered tools... it was well-timed, as our last battery went dead shortly before the power company hooked us up.We also have water unlocked and ready to rumble.Got our HVAC guy out, as well as the roofer.

Now I just make sure it's in lease that they know they're responsible for light bulbs and batteries (amazed at how many think I'm coming over to change a light bulb for them due to prior apartment living.)

There are some areas that are now requiring the landlords to change batteries annually by ordinance - the 10 year battery is not exempted.

I'll also add that I have asked 3 pediatricians in 2 different regions about the occurrence of Lead poisoning and was able to learn of one case, in which both parents of the child worked in a battery factory where lead exposure was common.

There was a great BP thread on this a long time ago. http://www.biggerpockets.com/forums/52/topics/68041A few things I've been doing lately: smoke detectors w/ 10 year batteries, glue drain assemblies under kitchen and bath sinks (high fail rate with junk screw pvc), removing storm doors, also going to ad a storm door addendum.