I used to love this phone a lot, but lately the battery is terrible and even flashing the firmware to a new start doesnt help, Goodbye Razer : r/razerphone
New Battery 4000mah Battery For Razer Phone 2 Rc30-0259 1icp4/69/81 Batteries Replacement Charger Battery Li-polymer Batterie - Mobile Phone Batteries - AliExpress
Rc30-0259 4000mah Replacement Battery For Razer Phone 2 Phone2 1icp4/69/81 - Mobile Phone Batteries - AliExpress
Synergy Digital Wireless Headset Battery, Compatible with Razer OPUS X Wireless Headset, (Li-Pol, 3.7V, 1000mAh) Ultra High Capacity, Replacement for Razer 1ICP5/34/50 1S1P Battery - Walmart.com