Simple battery change;
Gather tools needed to change battery, 10 & 12mm spanners.
Drive to auto parts store and purchase battery.
Remove old battery in the parking lot so you can return it without coming back.
Install new battery and tighten battery strap and connections.
Start car...car won't start and stupid security system is blinking and beeping.
Realize that you need key fob remote which you don't carry because it doesn't work to un-lock the doors and the plastic part that holds it to the key ring is broken.
Search car for key fob.
Remember that key fob is probably in nightstand drawer at home about 15mi. away.
Call wife who is at home to search through night stand drawer to find key fob.
Wife who has a cold, doesn't feel well and now has to bring you a key fob gets a bit p***ed off.
Wife get there about an hour later with key fob, you start pushing buttons madly to try and get security system to reset itself.
Take key fob apart to make sure everything is OK and get a better push on the buttons, still no luck.
Call AAA for a tow so you can get car home to try and figure it out.
Even more p***ed off the wife calls a friend nearby to go wait at her house while I wait for the tow truck.
While the wife is on the phone with her friend give one last try with the remote.
Car starts!!!
Cancel tow truck.
Drive home happy.
A little 'car'ma in action, the friend my wife was talking to, I've helped her out with her car twice, once pulling it out from being stuck in the snow, and the other replacing a bunch of blown fuses (VW, go figure

). YotaRu is now starting every time and the key fob now lives IN the center arm rest.