Don't blame the advances in battery technology ~ blame the idiots who buy such toys for children.
Well it wasn't bloody me!
I didn't suggest it was .... Personally I have a deep loathing of Aunts, Uncles and sundry others who buy babies such toys. They do not, in my experience, do anything but produce lazy children who cannot find their own amusement. Hide the bloody things and give the kid some cardboard boxes to hide in, spend some time teaching it nursery rhymes that it can recite/sing, soft toys it can mother and learn to dress ~ the child will be just as happy learning to play properly.
One of the best and quietest toys my three ever had was one of these.
They all learnt to fasten a zip, buttons, buckles, laces etc from it and, best of all, the bloody thing was quiet. All three used to sleep with it in their turn. It is, fortunately, washable.
All that said I have bought noisy, annoying, toys for grandchildren ~ just to get my revenge on their parents