Hey there! I see you're at Best Fiends level 1409 on your Kindle, running Android 9, and you mentioned you have low energy even when it's fully charged and you collected zero keys, which sounds unusual. Let's dig into that together.

First, just to clarify:
- Is the energy bar showing lower than it should even right after a full charge or how it usually appears?
- Are you seeing zero keys collected during gameplay in this level or generally?

Sometimes, these energy and key counts can be affected by game glitches, account syncing, or even cache issues on your device. Here's a step-by-step approach to try:

1. Restart the Game: Close Best Fiends completely (remove it from recent apps) and open it again to see if energy and keys update properly.

2. Check Your Internet Connection: Best Fiends may sync your energy and key progress with their servers. Make sure your Kindle has a stable internet connection.

3. Clear Cache: Since you're on Android OS 9 on Kindle, go to Settings > Apps > Best Fiends > Storage > Clear Cache. This can remove temporary data that might cause display issues without deleting your game progress.

4. Update the Game: Check if there's an update for Best Fiends in the Amazon Appstore. Running the latest version can fix bugs affecting energy or keys.

5. Log Out and Back In: If you use account login, try logging out and logging back in within the game to resync your progress.

6. Reinstall the Game (last option): If nothing else works, uninstall and reinstall Best Fiends. Usually, your progress is saved to your account, but ensure you have your login details handy before doing this.

Could you try these and let me know which steps you have already tried or if you need help navigating any of them? That way, I can guide you better.

Are you satisfied with the solution I provided so far?