APC BF500BB RBC21 compatible replacement. Sigma SG-RBC21 supplies one 12V high-rate battery. Compare the battery label, terminals and polarity before ordering.
RBC21 replacement battery specifications
| APC cartridge reference | RBC21 / APCRBC21 |
|---|---|
| Sigma battery model | SG1223W |
| Package contents | One 12V high-rate battery |
| Battery quantity | 1 |
| Voltage per battery | 12V |
| Capacity per battery | 5.2Ah at the 20-hour rate, per linked manufacturer sheet |
| Chemistry | Rechargeable AGM sealed lead-acid (SLA) |
| Battery terminals | Positive T2/F2 6.35 mm; negative T1/F1 4.75 mm |
| Dimensions per battery (L × W × case H) | 140 × 48 × 102 mm; 103 mm overall height |
| Approximate net battery weight | 1.63 kg total, excluding packaging |
| Supplier replacement reference | SG-RBC21 |
The product photo identifies the high-rate SG-RBC21 version. Capacity above follows the linked technical sheet.
Check your existing battery configuration
Match the complete UPS model and revision, RBC reference, battery voltage, dimensions, terminal type and polarity. Use the supplied photos to check connections and reuse suitable original UPS leads where required. Follow the UPS manufacturer’s replacement instructions. The UPS is not included.
Technical document
Download SG1223W specifications (PDF). This document describes each battery, not a complete wired UPS cartridge.
Related APC batteries
Browse APC UPS replacement batteries. Email Sales@RocketDistributing.com with your UPS model, RBC number, battery photos and quantity for matching help or volume pricing.
APC is a trademark of Schneider Electric. This is an aftermarket compatible replacement supplied by Sigma Power Systems.