is providing battery power to your equipment. On the other hand, the LED indicator gives you a warning which will flash every two seconds when the battery is low.
9.
LED: Bar chart LEDs showing UPS utilization. The LED indicator and the load level indicator will illuminate to show the load level; linearly subdivided in 25% steps.
10.
LED: Bar chart LEDs showing battery capacity
(remaining standby time). The 
LED indicator and battery level indicator will illuminate to show battery level. Each LED indicator displays a 25% capacity level.
11.PSDR FAIL: LED error display for corrupt inverter.
12.FAULT: Central error LED display, e.g. when UPS is overloaded or encounters a short circuit on the output.
13.BAD BAT.: LED for battery problem (e.g. discharged). The LED indicator will flash every two seconds when the battery failes or if the battery is disconnected. Please check your battery connection; replace the battery or contact your local dealer for a battery replacement kit.
14.OVERLOAD: LED for violation of overload time limit. The LED indicator will light on when the UPS overload timeout. (Information concerning the time limit is available in chapter 3.4).
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