Not required to be fully charged, but must have enough power to complete the flash process (2–5 minutes).
Use Infinity / 6.61 LME / PRO‑C2 on any PSP (1000/2000/3000/Go/E1000) via Memory Stick + launcher — no Pandora battery needed since 2011. Safer, permanent, no hardware mod.
Only need Pandora for TA‑088v3 / TA‑090v2 (early 3000) on OFW 6.61 if Infinity fails (rare).