M8 Charging Problem - Battery only lasts for 24h

Hey there, M8-experts
after having installed newer firmwares i recognized that i have to charge almost every day to keep my lovely M8 running... Unfortunately the battery has taken damage (i dont know how but it seems to be)... maybe the new firmware wich has not a good power management or it is simply the cold weather...
Anyway... i replaced the old battery by a new original 1200mA battery manufactured by Meizu itself... but the problem did not vanish...
The brightness is set to 40% with light sensors being switched on.. so the power consumption should not be that much that the battery only lasts for one day...
Maybe someone of you has faced the same problem... i've also read the thread about the battery issue a mate posted here , but i think i did nothing wrong... i charged the lithium-polymer battery whenever it was @ 20% or sometimes at 50% ...

Firmware is 0.9.5.198 ( with new UI )


please.... please help me

Unfortunately the power management in new UI is still in developement , don´t expect the one from old UI.

indeed,
if standby time is really that important switch back to 0938/0939 or adjust brightness to a lower setting and make sure Bluetooth + wifi is not activated.

ps, it is indeed an important factor;

it is simply the cold weather...