CyberPower RB1290 teardown
- Inside
- 1 x 12 V 9 Ah
- Wiring
- 12 V single
- List price
- $55
- Cell size
- 151 x 65 x 94 mm
- Terminal
- F2
- Evidence on cell count
- verified
What is inside the RB1290?
RB1290 holds one 12 V block rated 9 Ah, giving a 12 V bus. CyberPower publishes the cell count. There is no series string to balance, so it is the simplest swap here. Check the label on your old block before ordering a replacement.
| Field | Value | Quote | Source |
|---|---|---|---|
| cells | 1 | Battery Quantity | 1 | T1 cyberpowersystems.com |
| cell ah | 9 | Battery Size | 12 V / 9 Ah | T1 cyberpowersystems.com |
| envelope mm | 151 x 98 x 65 | (mm) | 151 x 98 x 65 (mm) | T1 cyberpowersystems.com |
| msrp usd | 55 | MSRP | $55 | T1 cyberpowersystems.com |
| terminal | F2 | This is a 12V 9Ah battery with a F2 terminal | T2 ellisbattery.com |
Which UPS models use the RB1290?
Of the 35 models we track, RB1290 fits CP1000PFCLCD, CP1000AVRLCD, CP850PFCLCD. That list comes from the manufacturer's pages, and they sometimes disagree with reseller listings. Where a model splits by serial number, its UPS page shows which prefix takes this cartridge, so check your label before you order.
| UPS | Rating | Serial condition |
|---|---|---|
| CP1000PFCLCD | 1000 VA / 600 W | all serials |
| CP1000AVRLCD | 1000 VA / 600 W | all serials |
| CP850PFCLCD | 850 VA / 510 W | Serial starts CX2 |
Which bare cells replace the RB1290?
Replace RB1290 with one 12V 9 Ah F2 cell and reuse the factory harness. CyberPower lists 151 x 98 x 65 mm. The terminal comes from a retailer cross-reference or inference, so check your old cell first. Keep the old harness, because bare cells ship without leads.
Can LiFePO4 replace the RB1290?
A 12.8 V LiFePO4 pack fits the RB1290 bay, but its BMS sets the limit. A 12 A BMS allows about 118 W on this 12 V bus. A single pack has no series balance problem to manage. Measure your real load before you buy.
At the listing's 20 A claim the ceiling is 197 W, and at 12 A it is 118 W. Why that matters.
How much does the RB1290 cost against bare cells?
RB1290 lists at $55. One bare cell costs about $34.94 at a non-Amazon single-unit reference price, a saving of roughly 36%. The reference is a CSB block at one store, and it is not an Amazon price. Reusing the harness is what makes this work.
Official RB1290 MSRP: $55. Typical Commodity Bare-Cell Band (Non-Amazon Reference): about $34.94 for 1 x CSB HR1234WF2. Reuse your factory wire harness to save about 36% against the OEM cartridge MSRP.