The Game Boy Advance SP is the first of Nintendo's handheld gaming devices to come with a built-in lithium-ion battery pack. Requiring a recharge after about eight hours of playtime, the charger cable connects the gaming unit to the power, converting the electricity into direct current.
Without the charger, the SP unit becomes unusable after the power is discharged because the system is designed to specifically use the lithium battery and does not accept AA batteries. It takes about three hours to fully recharge. Of the two LED lights on the side of the system, the bottom one lights up to indicate charging status; it turns off once the battery recharge is complete. The charger is also compatible with the first model of Nintendo DS, which uses a similar battery pack for power.