I found it on a Chinese online shopping website (Taobao). The cracked version runs Android 5.1.1 and the seller claims that the Android system will not affect battery. The cracked version is only based on the Japanese version. Also, the cracked version seems quite pricey (7800 CNY=1,155USD).
Link: https://item.taobao.com/item.htm?spm...d=550465848108
Link: https://item.taobao.com/item.htm?spm...d=550465848108