If you're looking for ease of use in your next set of bike lights, you should seriously consider the Bookman
Bike Light Set. These lights mount to any bike with an elastic pull and are surprisingly bright despite their size. Changing the batteries is also a breeze, and simply requires you to loosen the screws before you're back on the road.
1 Front light (white LED)
1 Rear light (red LED)
Lights attach to handlebar and saddle pole with an elastic pull
2 x CR2032 (in each)
To change batteries, loosen screws on the bottom
Slow flashing, fast flashing, steady light