CyberPower RB1270X2A teardown

Inside: 2 x 12 V 7 Ah
Wiring: 24 V series
List price: not published
Cell size: 90 x 70 x 106 mm
Terminal: F2
Evidence on cell count: verified

What is inside the RB1270X2A?

RB1270X2A holds two 12 V blocks wired in series rated 7 Ah, giving a 24 V bus. CyberPower publishes the cell count. Both blocks carry the same current and should be replaced together. Check the label on your old blocks before ordering a replacement.

Every ledger row for RB1270X2A
Field	Value	Quote	Source
cells	2	Battery Quantity \| 2	T1 cyberpowersystems.com
cell ah	7	Battery Size \| 12 V / 7 Ah	T1 cyberpowersystems.com
envelope mm	180 x 70 x 106	(mm) \| 180 x 70 x 106 (mm)	T1 cyberpowersystems.com
serial note	CQB or CR8	CP1350PFCLCD (serial numbers beginning with CQB or CR8)	T1 cyberpowersystems.com
cell count rd	2	CyberPower RB1270X2A UPS Replacement Battery (Requires 2/unit)	T2 rdbatteries.com
cell ah rd	5.4	Capacity \| 5.4Ah	T2 rdbatteries.com
terminal	F2	Terminal Type \| F2 Faston	T2 rdbatteries.com
cell dims in	3.54 x 2.76 x 4.21	Length \| 3.54 \| Width \| 2.76 \| Height \| 4.21	T2 rdbatteries.com
cross reference	PSH-1255FR, PS-1250F2	NCE: PSH-1255FR, PS-1250F2, CP1250-F2FR	T2 rdbatteries.com
reference usd rd	13.27	$13.27	T2 rdbatteries.com

Which UPS models use the RB1270X2A?

Of the 35 models we track, RB1270X2A fits CP1350PFCLCD. 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.

Models on this site that use RB1270X2A
UPS	Rating	Serial condition
CP1350PFCLCD	1350 VA / 880 W	Serial starts CQB or CR8

Which bare cells replace the RB1270X2A?

Replace RB1270X2A with two 12V 5 Ah F2 cube cells and reuse the factory harness. CyberPower lists 180 x 70 x 106 mm for the pack. A reseller confirms the terminal type, so no guesswork is needed. Keep the old harness, because bare cells ship without leads.

2 x Mighty Max ML5-12F2 12V 5Ah F2 cube

The 90 mm cube format, F2. Lower capacity than the OEM label.

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2 x CSB HR1221W 12V high-rate cube (the high-rate option)

High-rate cube. Confirm the F2 tab option before ordering.

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Can LiFePO4 replace the RB1270X2A?

We can't recommend LiFePO4 for RB1270X2A. The tray is only 90 mm long, and the LiFePO4 pack we checked is about 150 mm. Showing a link would mean guessing about fit. Buy the lead-acid cell or a factory LiFePO4 UPS instead, and see our method page for how we test fit.

High-voltage and thermal safety

UPS battery bays carry high-current DC, up to about 60 A at full load on these models and more at cutoff. Inverter capacitors inside the case can stay charged after unplugging, so never open a unit beyond its battery door. A shorted or mismatched pack can overheat or start a fire. The manufacturers sell only sealed lead-acid replacement packs (APCRBC, RB, RBC) for these units, and we found no OEM approval for LiFePO4. BMS trip limits, series balance drift and 0 V lockout on 24 V drop-ins are modeled from published BMS current ratings, not from UL or OEM certification, and no qualified engineer has reviewed them. Figures are estimates, so check your own unit's label and manual.

How much does the RB1270X2A cost against bare cells?

We can't state a saving for RB1270X2A. We found no published list price for it. A figure here would be invented, so this page leaves it out and points you to the sources we did check. Ask the manufacturer for current pricing.