How can I fix AirPod battery life lower than 24 hours of use?

I just got my Airpods gen 2 a couple of weeks ago. However the battery life is nowhere near the 24 hours Apple says. I took notes, and got **9½ hours** of listen time, before the Charging Case was empty (5%; no longer charging the Airpods). Once the Case is empty, the Airpods slowly discharge, inside the Case, at around 6% per hour. This appears to be the case for others, but this would mean they would be empty within a day. I exclusively use them when walking the dog, so **4 times** a day, for about **30 minutes**. I get only 4 days of use out of them, before I have to recharge them. **My question is**; Is it normal to get so few hours out of them, with my usage pattern? Or should I have them checked out, by the store, under warranty? I know the 24 hour they promise is under ideal conditions, but getting around half that seems odd. Other than this, I'm really liking my Airpods. Some additional info: 1. My volume is always below 50% 2. I have them connected to my iPhone 8 (which supports Bluetooth 5 AFIK) 3. "hey siri" is disabled 4. I only listen to podcasts (Overcast App) 5. After walking for half an hour, the Airpods charge is around 90-93%, which is about right (10% of 5 hours = half an hour). When I put them in their case, and wait for them to charge up again, the case loses 6-8%. One would expect this to be only 2-3%. 6. I measured charging only the case with a generic Charger Doctor, and got 326mAh of current usage (5% -> 100%). 7. One would expect the case to add 19 hours of usage (i.e. 24h total - 5h for the Airpods themselves). So I get exactly half. 8. I tried looking this up, but everyone is only talking about the battery life of the airpods themselves (5h), not the case (or both combined). 8. (I don't live near a Apple store)