Verify the headset settings are configured properly. If the Angel is set for stereo headsets and you are using mono headsets, audio quality may suffer and you will have increased battery consumption.

Battery consumption will increase if using the Angel with headsets in self-powered mode.

Battery consumption will increase if the Angel is being used for ANR power.

If the battery life seems unreasonably short, it may be time for a new battery. Under normal conditions, the battery should deliver acceptable performance for 2-3+ years. This can vary depending on use and storage conditions.