Regular Charing of my video doorbell

Hi I am finding I need to charge the battery on my doorbell on average every 4-6 weeks. I have motion frequency set to “Light”, and I also have the device set to detect “People Only”. Doorbell is set up at my back door, facing into my back garden. The only motion in this area is from family members. I fear, as we head into the winter months, with much less daylight hours, I may need to charge my dooyevey couple of weeks. I have a solar device connected, but it doesn’t appear to be helping extend the battery life. My sister lives in Dublin, she also had a Ring doorbell, and it lasts up to 3 months before recharge. Her doorbell is front facing, onto a busy street. Please help me.