My battery isn't the greatest, but my normal usage leaves me with 25-30% at the end of the night.

LG Health just auto runs all the time. I didn't even know I had it until about 4 months after getting the phone when I was searching the full list of apps for something, and it had all four months of activity data recorded and stored. It's kinda weird though when it comes to riding my bike, if I mount it on my bike it doesn't record any cycling activity, but when stashed in my backpack it does register me as cycling.