APC BK450 UPS backup battery compatible replacement. Sigma SG-RBC3 is a 12V 12Ah rechargeable AGM sealed lead-acid battery. The photo shows the supplied battery with T2/F2 terminals.
Reuse the existing UPS wires and connectors. The UPS and replacement wiring are not included. Match the full BK450 model designation, revision, battery label, polarity and available clearance before ordering.
APC BK450 replacement battery specifications
| APC cartridge replacement reference | RBC3 / APCRBC3 |
|---|---|
| Listed UPS model | BK450 |
| Sigma replacement reference | SG-RBC3 |
| Battery specification reference | SG12120T2 |
| Nominal voltage | 12V |
| Rated capacity | 12Ah at the 10-hour rate |
| Chemistry | Rechargeable sealed lead-acid (SLA), AGM |
| Package quantity | One battery; reuse existing UPS wires and connectors |
| Terminals | T2/F2, 0.250 inch (6.35 mm) |
| Length × width | 151 × 98.5 mm (5.94 × 3.88 inches) |
| Battery case height | 95 mm (3.74 inches) |
| Overall height including terminals | 101 mm (3.98 inches) |
| Approximate battery weight | 3.8 kg (8.38 lb), per the linked specification |
Fit and installation
The supplier lists BK450 for this replacement. Compare the dimensions, terminal width and terminal positions with your installed battery and equipment documentation. Allow clearance for the attached connectors above the terminals. Follow the UPS manufacturer’s replacement procedure and charging requirements. Do not assume replacement while powered is permitted.
Battery documents
Sigma links the SG12120T2 specification for the battery used in this SG-RBC3 replacement.
Related batteries and ordering help
Browse APC UPS backup batteries. Email Sales@RocketDistributing.com with your BK450 model label, current battery and connector photos, quantity and delivery location for matching help or volume pricing.
California Proposition 65 warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. See P65Warnings.ca.gov.
APC is a trademark of Schneider Electric. This is an aftermarket compatible replacement supplied by Sigma Power Systems.