Dear Danha,
With the power to the Ring Video Doorbell 2 being hardwire supplied by the transformer/resistor combination, the Status for power under Device Health in the Ring app should always be at or near 100%. Occasionally, my power status will dip as low as 94%, but by the next day, the power status is again up to or near 100%.
I know that if motion is being detected frequently and if videos are being produced frequently, the Ring device will draw down the power more quickly than otherwise. However, the power status should recover as motion and videos are less frequently triggered, as in the nighttime, for example.
Hope that helps.
MZ