Siemens 6FX1143-5BA00 Sinumerik Battery Unit is a compact battery module designed for Siemens SINUMERIK CNC controllers. It is associated with the SINUMERIK 810/820 family and is listed under part number 6FX1143-5BA00; some catalogs also describe it as a SIMATIC S5 battery module. With a weight of about 0.21 kg, this unit supplies dedicated backup power within the SINUMERIK system to support operation when main power is unavailable.
