Anybody know where to find a battery that will fit in the Shield Tablet? I know there are several threads online (here on xda, on GeForce forums, and other places) that discuss replacing the shield tablet battery and a few different part numbers / batteries that work, but all those threads are from 2016 and 2015, and all the suggested batteries can no longer be purchased (out of stock and/or discontinued everywhere I've looked). My Shield Tablet battery still works, but it's getting weak and I'd like to bring to back to it's full glory (only get about 3 hours of SOT anymore and AccuBattery lists the estimated capacity at about 3400mah out of the original 5200mah).