Battery backups are a little heavy yes. I have a Nightcore 10000 that isn't too terrible. One thing that you can do is put your phone in airplane mode, turn on battery saver, the whole works. You can even tell it that you don't want to sit there and search for 5G that you prefer LTE. Just don't forget to reset everything back to normal when you get home! That stuff really does save on the battery. I usually then charge up, and shut my phone off overnight. But I have an SOS Beacon from zoleo so that might be a little different scenario! I hope you can get some good day hikes in somewhere else even if not on the Ice Age Trail!