Question about Windhager Animal repellent devices

In summer, the battery lasts quite long, thanks to the small solar module on the device. In winter, however, the batteries are empty again after just one day. However, the batteries supplied are also not of very high quality, and if you replace them with better ones, the time until the next charge is 2-3 weeks.

In my experience, the charge lasts about 3 weeks in summer. In winter
it only lasts about 2 weeks. (Of course, this also depends on the number of movements in the monitored area.
reduce the range to improve it).