APC SU3000RMI UPS backup battery compatible replacement. Sigma SG-RBC11HR is an AGM sealed lead-acid replacement supplied for the SU3000RMI. One complete replacement set containing two 24V 18Ah modules is included.
Match the full UPS model and revision, existing cartridge label, connector, wiring and fuse arrangement before ordering. The source lists SU3000RMI with the RBC11HR family. The UPS itself is not included.
Both battery modules are supplied. Each module is rated 24V 18Ah. Keep the original system wiring configuration; the module rating does not by itself define the complete UPS battery bank voltage or capacity.
This is the high-rate version. The supplier lists 18Ah per module and links the RG1218-70HR technical reference below. Compare the discharge tables at your intended load rather than assuming a fixed runtime advantage.
APC SU3000RMI replacement specifications
| APC cartridge reference | RBC11 / APCRBC11 |
|---|---|
| Listed equipment or cartridge reference | SU3000RMI |
| Sigma replacement reference | SG-RBC11HR |
| Package contents | One complete replacement set containing two 24V 18Ah modules |
| Module voltage | 24V |
| Capacity per module | 18Ah, supplier-listed |
| Chemistry | Rechargeable sealed lead-acid (SLA), AGM |
| Internal battery quantity | 4 batteries total; two series-connected batteries per module |
| Dimensions per module | 7.13 × 6.1 × 7.4 inches |
| Supplier-listed approximate assembly weight | 46 lb (approximately 20.87 kg) |
| Connection | Compare connectors, fuse and wiring with the existing assembly |
| Supplier-linked battery technical reference | RG1218-70HR |
Installation and compatibility
Compare all connections and dimensions against the installed battery assembly and your UPS documentation. A shared base battery, voltage or cartridge family alone is not a complete fit check. Follow the UPS manufacturer’s replacement procedure and do not assume the battery can be replaced while equipment is powered.
Internal battery documents
The supplier links the following RG1218-70HR technical documents for this high-rate assembly. They do not describe the overall cartridge dimensions or the wiring configuration of your UPS.
Related batteries and ordering help
Browse APC UPS backup batteries. Email Sales@RocketDistributing.com with your SU3000RMI label, cartridge number, 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.