Fi collar 3 battery died quickly with dog sitter

I’ve had the Fi Collar 3 for a week, and was excited to have my dog wear it when staying with the sitter. I asked the sitter to download the app, but when it requested location use on her phone, she didn’t feel comfortable enabling that. The first few days when I had the collar and the dog was with me, only a couple percentage points of battery died per day. With the sitter, almost 45% of the battery has drained in only three days. I did not leave the charger with the sitter because I thought the battery life was months. The battery is only a day or two away from dying.

This is very disappointing. Why is it draining so much?