I also have the same issues. 6 batteries that connect at random and you never know which one you are connected too. Things that need to be fixed to make this app somewhat usable are as follows:
1) Show the name of the current battery you are connected to on the main screen.
2) Have the user confirm a connection to a battery and STORE that name on the app.
3) Add a new area where a user can select the battery to view from the STORED battery names.
That would be a BASIC start on fixing this app. If that much can't be done, it is useless to those of us with more that one battery unless you have another app that can be used for this information.