Enhancement: Handle Multiple Batteries

### Describe the feature you'd like
User should be able to select which batter they want displayed if the system has multiple.

### Describe risks you've considered
Batter code will be a bit more complicated.

### Describe alternatives you've considered
Filter out "invalid" batteries.

The issue does not name any files, tests, or entry points. Start by locating the current battery-display logic in the repository and determine how multiple batteries are detected and selected; done means a user can choose which battery is displayed without invalid batteries being handled ambiguously.

Written by the indexing model from the issue text.