Out of the box, Battery Bar Pro’s estimates are wrong . It needs 2-3 full discharge cycles to learn your battery’s personality. For the first 48 hours, the time remaining will jump erratically. This is a technical necessity (battery fuel gauges need learning), but new users often uninstall it in frustration before it gets smart.
Lithium-ion batteries degrade over time. Battery Bar Pro provides a real-time window into this degradation via the metric. battery bar pro