Amazon.com: Replacement Battery for Nvidia Shield Game Controller,Shield TV Game Controller,P2920,fits HFR-50AAJY1900x2(B),HRLR15/51,1800mAh/4.32Wh : Video Games
Games Console Battery Replacement for Nvidia HFR-50AAJY1900x2(B), HRLR15/51 - 1800mAh, 2.4V | 888203397
How to replace Shield Android TV remote batteries | Android Central