[FTC]: IR Beacon Battery Power

So I put a nearly dead battery into the IR beacon. Our IR sensor reported only like 10 instead of the nearly 200 for a full battery. I’m hoping/assuming that all batteries for the IR beacons will be brand spanking new.

I’m curious has anyone collected any data about the rate at which the IR beacon diminishes in strength? I hope it’s full power until the last of the battery at which point it reduces dramatically.

Do you know if the red “low battery” light was on? That was the indicator I used to change batteries last year.