I have my c425 for about a month, it is connected through a Xiaomi WiFi extender pro, the camera is located on my back garden, I always have my camera on privacy mode, only use it while out, since it's a backyard on a rural area, there is no people, cars, only trees moving with the wind, I have movement detection disabled because of this. I have a daily battery drain of about 5% every single day, important to notice, I switch internet off every night and switch it back on in the morning. Signal strength is good. I already ordered a solar panel in the hope it solves the issue, at this pace I have to charge the camera every two weeks, way far from the alleged 300 day battery life.

I also have a d230s1 doorbell camera, I have multiple detections of people and car passing by and battery life has being great.