Customer found BBU in low battery health status.
That does not mean the failure of the component. BBU can have such status during periodic discharge test. Periodic discharge test for BBU happen every 3 months for each BBU.
In logs we can find following information:
From the screenshot above we can see that periodic discharge test happen each 3 months on 15th (for this storage).
The situation is the same for two other BBUs
After discharge test ended, the status of BBU became normal.
If BBU status if failed after discharge test, it should be replaced.