APC APCRBC161 teardown

Inside
2 x 12 V 9 Ah
Wiring
24 V series
List price
$164
Cell size
151 x 65 x 94 mm
Terminal
F2
Evidence on cell count
inferred

What is inside the APCRBC161?

APCRBC161 holds two 12 V blocks wired in series rated 9 Ah, giving a 24 V bus. APC titles it "Back-UPS Pro, 24V 9Ah". We inferred the count from its voltage and size. Both blocks carry the same current and should be replaced together. Check the label on your old blocks before ordering a replacement.

FRONT ELEVATION: 2 x 12 V, 24 V DC BUSCELL 1tabs F2+−CELL 2tabs F2+−RED TO UPS (+)BLACK TO UPS (−)each cell 151 x 65 x 94 mmPLAN VIEW, TO SCALE: CASE FORMATS151 mm65Standard 7-9 Ah (this page)CSB HR1234WF2, 94 mm case height151 mm51Slim 6 AhCSB HR1224WF2F1, 94 mm case height90 mm705 Ah cubeCSB HR1221WF2, 102 mm case heightFASTON TAB WIDTH, ENLARGEDF1 4.75 mm / 0.187"F2 6.35 mm / 0.250"
Every ledger row for APCRBC161
FieldValueQuoteSource
oem titleAPC Replacement Battery Cartridge for Back-UAPC Replacement Battery Cartridge for Back-UPS Pro, 24V 9Ah lead-acid batteryT1 se.com
msrp usd164MSRP$164.00T1 shi.com
shi compatAPC Replacement Battery Cartridge #161APC Replacement Battery Cartridge #161T1 shi.com
bus v24Voltage | 24VT2 partssource.com
envelope in11.90 x 2.56 x 4.30Dimensions | 11.90 x 2.56 x 4.30 inT2 partssource.com

Which UPS models use the APCRBC161?

Of the 35 models we track, APCRBC161 fits BN1500M2, BR1350MS. 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 APCRBC161
UPSRatingSerial condition
BN1500M21500 VA / 900 Wall serials
BR1350MS1350 VA / 810 Wall serials

Which bare cells replace the APCRBC161?

Replace APCRBC161 with two 12V 9 Ah F2 cells and reuse the factory harness. The sled measures 302.3 mm long. 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.

2 x Mighty Max ML9-12 12V 9Ah F2
Standard AGM, F2. The like-for-like choice.
Check Prime Price & Stock on Amazon →
2 x CSB HR1234WF2 12V 9Ah High Rate (the high-rate option)
High-rate AGM, F2. Holds up best at UPS discharge rates.
Check Prime Price & Stock on Amazon →

Can LiFePO4 replace the APCRBC161?

A 12.8 V LiFePO4 pack fits the APCRBC161 bay, but its BMS sets the limit. A 12 A BMS allows about 236 W on this 24 V bus. Series packs add volts rather than amps, and they can drift apart on the charger. Measure your real load before you buy.

2 x 12.8V 10Ah LiFePO4, F1 terminal
Listing claims a 20 A BMS and doesn't say whether that is continuous.
Check Prime Price & Stock on Amazon →
2 x F1 to F2 terminal adapters, pair (4 adapters needed)
One pair covers one cell.
Check Prime Price & Stock on Amazon →

At the listing's 20 A claim the ceiling is 394 W, and at 12 A it is 236 W. Why that matters.

How much does the APCRBC161 cost against bare cells?

APCRBC161 lists at $164. Two bare cells cost about $69.88 at a non-Amazon single-unit reference price, a saving of roughly 57%. 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 APCRBC161 MSRP: $164. Typical Commodity Bare-Cell Band (Non-Amazon Reference): about $69.88 for 2 x CSB HR1234WF2. Reuse your factory wire harness to save about 57% against the OEM cartridge MSRP.