I have just gotten a toumapet a few days ago but mine uses 3 regular AAA batteries and I find the batteries die out very fast..like in a couple of days! The batteries read over half full on my battery tester but the batteries give a black screen if I try reinserting them. Only when I add fresh new AAA batteries that the coloured screen comes back on and stays on. I never saw the option of there being a usb hookup charging one either which would have been a far better option.
I have a tamagotchi square sugar cube one coming in shortly but I think that takes 3 regular AAA batteries only as well. I do like the idea that one can communicate with another toumapet tamagotchi tho.
I'm presently on a tamagotchi scavenger hunt.. on the cheap...lol. I also ordered the moon elf tamagotchi cos it has cats and dogs. I think it's screen is only black and white tho...??? Anyways... could be interesting...lol