I have a kid (3 yo) with toys that do stuff and/or beep. Easily 100 AA batteries in JUST her toys. (although she does not play with many anymore so they are getting packed up for donation) Funny thing is we got her a wooden train set, no batteries at all, and now almost all the fancy electronic toys are left alone! We will see if this holds true for more than a few weeks. Amazing how much more powerful imagination is than batteries. Try telling that to my wife.