In reconfiguring their portable, Sony paid attention. Pandora's Battery made modding the PSP firmware, and thus software piracy, very easy. SCEA's John Koller said the PSPgo's battery was made internal-only for just that reason.
"You won't be able to rip your games and play them on the [PSPgo] system, the firmware precludes that," Koller told PlayStation Insider. "There's no external battery, so there's a number of protections put into place on the system."
The drawback? When that battery starts to go, you can't swap it yourself. Back it goes to Sony for replacement, at a fee if it's out of warranty.
Why You Can't Remove the Battery from the PSPgo [PlayStation Insider]