The decision in the last few years to include AA or AAA alkaline batteries in the current larger size figures is causing a major headache; you would like to keep the figures sealed up, but with the inclusion of AA or AAA batteries instead of the old button cell batteries you found in calculators etc., you now run the risk of a battery leak at one point or another if you keep the figures sealed up. And that could ruin a perfectly fine figure. I just took out the batteries from my 1992 G2 Optimus Prime's voice box (had forgotten about these) and these had the print "JAN 2001" (expected expiry or best before date, I guess) on them. There was no juice left, as was expected, and fortunately there was no leakage either. But these were Duracells; I suspect those included with the larger Transformers figures made nowadays are the cheapest no-name batteries you can find. I guess you have no choice but to open and remove the batteries from the figures you have in storage, unless you want to make an unpleasant discovery in a few years time. What happened here, then? Did US and/or EU consumer legislation force Hasbro and other toy makers to include batteries with battery-operated products so that these would work right out of the box?