I get my oneplus 7 GM1900 and flashed it with the 9.58BA Firmware. All works good but the battery sucks after 4,5 hours. No heavy usage, a litlle WiFi Surfing and Facebook. Others wrote fron 8-9 hours sot. Have anyone an tip for ne to make more sot. On my old oneplus 5 i habe 8-9 hours sot.