You must confirm the battery model compatibility (e.g., PSP-110 for the 1000 series or PSP-S110 for the 2000 series). Ensure the battery uses high-quality lithium-ion cells to prevent swelling, which is a common issue with aged stock. Verify the EEPROM chip quality, as the 'Pandora' function relies on the battery's ability to transmit a specific serial number (0xFFFFFFFF) to the console's motherboard. For modern B2B sourcing, look for 'Switchable' Pandora batteries that allow users to toggle between 'Normal' and 'Service' modes via a physical switch.