Patent ID: 8806238

Claim:
An operating method applicable to a rack server system having a battery backup unit (BBU) and at least one server, the operating method comprising: communicating between the server and the BBU; providing status information and a previous self-discharging test information from the BBU to the server for the server to judge a status of the BBU; and providing power from the BBU to the server and adjusting a loading of the server according to the status information of the BBU when an input power is interrupted; wherein, the BBU comprises a plurality of BBU sub-systems connected in parallel, each BBU sub-system comprises a plurality of BBU modules, and the operating method further comprises: after a new BBU sub-system or a new BBU module is loaded into the BBU, judging by the BBU, by the new BBU sub-system or by the new BBU module whether charging is completed, and after charging is judged to be completed, transmitting status information from the new BBU sub-system or the new BBU module to the server or storing the status information in the BBU; and receiving and recording the status information of the new BBU sub-system or the new BBU module in the server.