A GBA Charger/Adapter stupid
No it does not, you need to use your ds charger.
No, the chargers are different and will not work.
No, though it can use a DSi or DSi XL's charger.
The very first model of the DS uses the same charger as the GBA. In fact if you look at the DS charger, it says it is 'for use with AGS-001 & NTR-001 only'. NTR is the code for Nintendo DS, AGS is the GBA.
ANSWER:No. the Nintendo DS AC Adapter is too small and won't fit the GBA, you'll need to buy an AC GBA adapter or buy another GBA SP that has an AC adapter with it from stores.
Define always work. Everything will eventually wear out and break. The question posed is the same as will my DS always work. The answer there is no. Is your charger broken?
The original Gameboy and the original GBA use batteries. The GBA SP has a charger, but the 'jack' is one that fits the GBA SP (and original DS) only. A DSi charger fits only the DSi, it will not work with any other model of DS or GBA, even the DSi XL.
No. The black charger for the DS and the dark grey charger for the DS lite are incompatible with the 3DS. You need the pale grey charger that has been released with all of Nintendo's handhelds from the DSi onwards.
The regular Nintendo charger cannot be used for this, as the systems have different power jack sizes. If you need a charger for both, try the GameBoy Advance GBA SP 3-in-1 Car Charger. It can be used on both systems as it includes removable tips.
The GBA SP and SP+ uses it, as well as the original DS but not the lite.
New GBA chargers cost roughly $40, but may cost more or less depending on where you shop.