This battery lasted me 9 years, starting 2012. Thank you for your service. : r/3DS
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Amazon.com: Nintendo 3DS XL Battery Replacement SPR-003 (NOT COMPATIBLE WITH REGULAR 3DS) : Video Games
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SuperSmashMedia® - 1300mAh Replacement Battery Pack Kit for Nintendo 3DS Console with Screwdriver Included CTR-003 (Nintendo 3DS) : Amazon.co.uk: PC & Video Games
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