The PSP2 is very easy to power! They take 5V, 500 mA, so it is compatible with these cell phone charger batteries that are ubiquitous. You need a USB > plug cable, and you can go to Radioshack to get an adaptaplug cable with the appropriate plug.
I usually put in the 6 AA batteries, then plug in the external. I've never had a situation where I ran out of the external, but in case I do, it will switch to the internals.
I just scored one.
Any tips on remote power? I have DVD batteries and a Naztech15000.
What is the input voltage range ?
Mics: B&K 4011, Schoeps MK5 (Nbobs, Naiant PFA), Busman BSC-1 (K11/K21/K31/K41 caps), Church CA-14 (o, c), Church CAFS, Core Sound Binaurals
Pre: EAA PSP-2, Lunatec V3, Nbox-Platinum, Church CA-9200
ADC: Mytek 192 ADC, Oade Mod SBM-1
Rec: Oade Supermod PMD-661, Tascam DR60D, M-Audio MicroTrack II, Korg MR-1 (32GB SSD mod); Sony PCM-M10, Edirol R09HR; iRiver HP-120
Photo: Canon 5D3, Canon EF-S 17-55mm f2.8, Canon EF 35mm f1.4L Canon EF 24-70 f2.8L MkI, Canon EF 70-200mm f2.8L IS MkI, Canon EF 50 mm f1.4, Canon EF 50 f1.2L, Canon EF 300 f/4L IS, Canon EF 100-400 f4-5.6L IS MkI
Video: Canon HF100