Recording the history curves and keeping the capacity log will give better results, as longer as Battery Monitor has a chance to monitor your battery. The application should run whenever possible. You can ensure this by letting macOS start Battery Monitor automatically when you log in. Perform the following steps to do that:
Whether the Overview Window should open upon each start can be controlled by the preferences of Battery Monitor. Deactivating the auto-start feature is possible by repeating the steps mentioned above.