Your PS250I or SC450RMI1U is still doing its job, but the battery inside it is on borrowed time. You don't need a whole new unit — you need the right battery, today. The RBC18 is the exact fit. 12V, 9Ah, one cable, connectors in the box. Two-minute swap and your power backup is back where it should be. No three-week wait from a chain that has to "source" the part from a regional depot
| brand | APC |
| model | RBC18 |
| battery_type | Lead-acid (VRLA) |
| voltage | 12 VDC |
| capacity | 9 Ah |
| cables_included | 1 |
| mounting | Stand-alone battery stack |
| warranty | 2 years |
| compatible_ups_models | PS250I, PS450I, SC250RMI1U, SC450RMI1U |
| operating_temperature | 0–40°C |
| storage_temperature | -15 to 45°C |
| humidity_operating | 0–95% |
| altitude_operating | 0–10,000 ft |
| included_items | All required connectors, battery recycling guide, reusable packaging, installation guide |
