Ultraman 12" electronic figures (Gomora & Redking)

[KaijuDave]

Hi all. I just got these two 12" Bandai figures of Gomora & Redking that are Electronic (they each have a sensor & speaker so I assume they roar). Here's the links to them:


My question is, does anyone out there know how or where I replace the batteries in these things? I don't want to break them open if I don't know what I'm doing (most of my figs are static, non-electronic vinyls).
Also, where would I find more info on these Kaiju? (stats/powers, movie appearances, etc). I'm not an UltraFan (I just got them to add to my Godzilla collection since they look cool!) Any help would be appreciated. Thanks in advance!