Authentic cartridge. Tested on multiple Game Boy Advance SPs and an Analogue Pocket before shipping.

Brand new CR1616 battery installed for the real-time clock, from fresh stock. Expect 10-15 years of battery life. Gen 3 pokemon cartridge saves are flash-based. The battery powers time-based events. Save file is verified working. Pins are cleaned and inspected.

I combine shipping automatically unless you ask otherwise.