Inaccurate Battery Wear Meter

On my Lenovo IdeaPad S10, I've installed BatteryBar for more than a month. The readings for Battery Wear were erratic 0.2%, 0.3%, 2.1%, 2.2%, 2.3%, 0.7%, 2.3%, 2.4%, 2.2%, 2.3%, 0%, 2.5% and lately to 0.1%.

Does it mean my battery is getting better with time? I don't think so.