Step 3 Lower Case. Remove the 6 Tripoint screws holding the case together. Pry the 2 halves apart. Do not force it though, or you may break your GBA. Set the bottom half away for later. Be sure not to lose the small, square nut that hold the battery compartment nut in or else you will not be able to screw the battery compartment in. Add a comment.
Mahko (moderator on Gameboy subreddit; goes by the handle Admiral_Butter_Crust) put out a really nice video on replacement SP batteries on youtube. Around the 3:00 minute mark, he talks about these batteries. In summary, he said they tested above capacity and that he liked them. Check it out: Game Boy Advance SP Battery Round Up.
Gameboy Advance SP Battery Pack, 850mAh Replacement Rechargeable Lithium-ion Battery + Tool Pack Kit Compatible with Nintendo GBA SP 4.6 out of 5 stars 367 $10.99 $ 10 . 99
GBA SP Ultimate Consoles; Replacement Shell for Game Boy Advance - Laminated IPS/ITA - Funnyplaying (Clear Black) USB-C Battery Cover for Game Boy Advance
Here is the analysis for the Amazon product reviews: Name: OSTENT 850mAh Rechargeable Lithium-ion Battery Tool Pack Kit Compatible for Nintendo GBA SP. Company: OSTENT. Amazon Product Rating: 4.5. Fakespot Reviews Grade: B. Adjusted Fakespot Rating: 4.5. Analysis Performed at: 03-17-2023.
This item: Gameboy Advance SP Battery Pack, Upgraded [1600mAh] GBA SP Rechargeable Lithium-ion Battery Replacement for GBA SP, AGS-001, SAM-003 with Tool Pack Kit $15.80 $ 15 . 80 Get it by Sunday, Jan 14
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