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UPS Batteries and Replacement Packs

These five battery packs are compared on chemistry, voltage, amp-hour or watt-hour capacity, form factor, the exact named UPS range and price. Chemistry ranges from sealed lead acid to lithium-ion, with several listings missing voltage or capacity figures entirely, and one product showing a discrepancy between its stated voltage and its module description. Prices run from £38.89 to £1,373.77, so buyers should check electrical details and named compatibility against their own UPS model before ordering.

5 selected productsListing snapshot 23 October 2026Selection Editorial
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PC Hardware Compare editorial teamProduct information editor

Winner

Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC B

The Origin Storage RBC2 at £38.89 is the lowest priced option here and a practical starting point, rather than a pick for every UPS model.

Check price at PCHub
ProductBrandPriceRetailersListed product details
Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC BOrigin Storage£38.89PCHubOrigin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC Back-UPS Back-UPS Pro PowerShield
Eaton 5PXEBM48RT2UG2 UPS battery Sealed Lead Acid (VRLA) 12 V 9 AhEaton£456.88PCHub5PX Gen2 Extended Battery Module (EBM). 48 V. Rack/Tower. 2U
CyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 ACyberPower£463.86PCHubCyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah
Digitus UPS External Battery Pack for 3kVA UPS Model (Extended Pack)Digitus£614.67PCHubA solution that increases the operating capacity of intelligent UPS systems to protect IT devices with medium to high loads- Rack / tower with convertible design- Hot swappable Batteries can be exchanged during operation- Supports rapid extension of backup time in case of increased need for capacity
APC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL ExtenAPC£1,373.77PCHubAPC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Extended runtime model. 48V 2400Wh. 2U Rackmount
Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC B

1. Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC B

Check price at PCHub
Price shown £38.89

A replacement battery cartridge listed for APC Back-UPS, Back-UPS Pro and PowerShield models.

The Origin Storage RBC2 is listed as a replacement battery cartridge for APC Back-UPS, Back-UPS Pro and PowerShield units.

Chemistry, voltage and capacity are not specified for this product, so buyers should confirm these figures against their exact UPS model before purchase.

Benchmark

Geekbench does not benchmark the primary function of Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC B. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Battery discharge and runtime testing

Compare usable runtime at a fixed load and temperature, then verify recharge time and cycle behaviour.

A comparable third-party result for Origin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC B is not included here. See UPS runtime and testing guidance explains the relevant test or benchmark method.

At £38.89 this is the cheapest pack in the roundup.

Product specifications
SpecificationInformation
BrandOrigin Storage
Price£38.89
Listed product detailsOrigin Storage Origin Replacement UPS Battery Cartridge RBC2 for APC Back-UPS Back-UPS Pro PowerShield

Compatible hardware

  • Check against UPS battery backupsMatch the battery pack to the exact UPS model, voltage, chemistry and connector.
  • Check against Network switchesConfirm the UPS model powering the switch uses this exact replacement battery.
  • Check against Desktop PCsCheck the replacement pack fits the UPS protecting the PC and matches its electrical rating.

What we like

What we don't like

  • Chemistry not specified
  • Voltage and capacity not specified
Check price at PCHub
Eaton 5PXEBM48RT2UG2 UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah

2. Eaton 5PXEBM48RT2UG2 UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah

Check price at PCHub
Price shown £456.88

A battery product whose name describes sealed lead acid VRLA 12 V 9 Ah cells, while its description separately refers to a 48 V 5PX Gen2 Extended Battery Module in rack or tower 2U form.

The Eaton 5PXEBM48RT2UG2 is named as a sealed lead acid VRLA battery rated 12 V and 9 Ah, yet its description separately identifies it as a 5PX Gen2 Extended Battery Module rated at 48 V in a rack or tower 2U form factor.

This is a clear discrepancy between the two sets of figures, and buyers should check the exact specification sheet or contact the seller before ordering to confirm which voltage and form factor applies.

Benchmark

Geekbench does not benchmark the primary function of Eaton 5PXEBM48RT2UG2 UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Battery discharge and runtime testing

Compare usable runtime at a fixed load and temperature, then verify recharge time and cycle behaviour.

A comparable third-party result for Eaton 5PXEBM48RT2UG2 UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah is not included here. See UPS runtime and testing guidance explains the relevant test or benchmark method.

At £456.88 this is the second lowest priced pack in the roundup, £6.98 below the CyberPower battery, but the differing voltage details need confirmation.

Product specifications
SpecificationInformation
BrandEaton
Price£456.88
Listed product details5PX Gen2 Extended Battery Module (EBM). 48 V. Rack/Tower. 2U

Compatible hardware

  • Check against UPS battery backupsMatch the battery pack to the exact UPS model, voltage, chemistry and connector.
  • Check against Network switchesConfirm the UPS model powering the switch uses this exact replacement battery.
  • Check against Desktop PCsCheck the replacement pack fits the UPS protecting the PC and matches its electrical rating.

What we like

What we don't like

  • Conflicting voltage figures between product name and description
  • The 9 Ah figure appears in the name but not in the module description
Check price at PCHub
CyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 A

3. CyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 A

Check price at PCHub
Price shown £463.86

A sealed lead acid VRLA battery rated 12 V and 9 Ah, with no model compatibility or form factor listed.

The CyberPower BPSE72V40ART2U is a sealed lead acid VRLA battery rated at 12 V and 9 Ah.

No named UPS model compatibility or form factor is listed for this product, so buyers should confirm suitability with the seller before ordering.

Benchmark

Geekbench does not benchmark the primary function of CyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 A. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Battery discharge and runtime testing

Compare usable runtime at a fixed load and temperature, then verify recharge time and cycle behaviour.

A comparable third-party result for CyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 A is not included here. See UPS runtime and testing guidance explains the relevant test or benchmark method.

At £463.86 this is priced close to the Eaton product in this roundup.

Product specifications
SpecificationInformation
BrandCyberPower
Price£463.86
Listed product detailsCyberPower BPSE72V40ART2U UPS battery Sealed Lead Acid (VRLA) 12 V 9 Ah

Compatible hardware

  • Check against UPS battery backupsMatch the battery pack to the exact UPS model, voltage, chemistry and connector.
  • Check against Network switchesConfirm the UPS model powering the switch uses this exact replacement battery.
  • Check against Desktop PCsCheck the replacement pack fits the UPS protecting the PC and matches its electrical rating.

What we like

What we don't like

  • No named UPS model compatibility listed
  • No form factor listed
Check price at PCHub
Digitus UPS External Battery Pack for 3kVA UPS Model (Extended Pack)

4. Digitus UPS External Battery Pack for 3kVA UPS Model (Extended Pack)

Check price at PCHub
Price shown £614.67

An extended battery pack for a 3 kVA UPS model, in a rack or tower convertible form factor with hot-swappable batteries.

The Digitus UPS External Battery Pack is described as an extended pack for a 3 kVA UPS model, with a rack or tower convertible form factor.

It features hot-swappable batteries, though no voltage, chemistry or capacity figures are stated, so buyers should confirm these details against their exact UPS model.

Benchmark

Geekbench does not benchmark the primary function of Digitus UPS External Battery Pack for 3kVA UPS Model (Extended Pack). Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Battery discharge and runtime testing

Compare usable runtime at a fixed load and temperature, then verify recharge time and cycle behaviour.

A comparable third-party result for Digitus UPS External Battery Pack for 3kVA UPS Model (Extended Pack) is not included here. See UPS runtime and testing guidance explains the relevant test or benchmark method.

At £614.67 this is priced above the lead acid packs but below the lithium-ion option in this roundup.

Product specifications
SpecificationInformation
BrandDigitus
Price£614.67
Listed product detailsA solution that increases the operating capacity of intelligent UPS systems to protect IT devices with medium to high loads- Rack / tower with convertible design- Hot swappable Batteries can be exchanged during operation- Supports rapid extension of backup time in case of increased need for capacity

Compatible hardware

  • Check against UPS battery backupsMatch the battery pack to the exact UPS model, voltage, chemistry and connector.
  • Check against Network switchesConfirm the UPS model powering the switch uses this exact replacement battery.
  • Check against Desktop PCsCheck the replacement pack fits the UPS protecting the PC and matches its electrical rating.

What we like

What we don't like

  • No voltage or chemistry stated
  • No capacity figure stated
Check price at PCHub
APC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Exten

5. APC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Exten

Check price at PCHub
Price shown £1,373.77

A lithium-ion external battery pack for 1, 2 and 3 kVA SRVL extended runtime models, rated 48 V and 2400 Wh in a 2U rackmount form factor.

The APC Easy UPS Lithium-ion External Battery Pack is rated at 48 V with a capacity of 2400 Wh, built in a 2U rackmount form factor.

It is listed for 1, 2 and 3 kVA SRVL extended runtime models, the only lithium-ion chemistry in this roundup, with named compatibility stated clearly.

Benchmark

Geekbench does not benchmark the primary function of APC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Exten. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Battery discharge and runtime testing

Compare usable runtime at a fixed load and temperature, then verify recharge time and cycle behaviour.

A comparable third-party result for APC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Exten is not included here. See UPS runtime and testing guidance explains the relevant test or benchmark method.

At £1,373.77 this is the most expensive pack in the roundup.

Product specifications
SpecificationInformation
BrandAPC
Price£1,373.77
Listed product detailsAPC Easy UPS Lithium-ion External Battery Pack for 1/2/3kVA SRVL Extended runtime model. 48V 2400Wh. 2U Rackmount

Compatible hardware

  • Check against UPS battery backupsMatch the battery pack to the exact UPS model, voltage, chemistry and connector.
  • Check against Network switchesConfirm the UPS model powering the switch uses this exact replacement battery.
  • Check against Desktop PCsCheck the replacement pack fits the UPS protecting the PC and matches its electrical rating.

What we like

What we don't like

  • Highest price in the roundup
  • 2U rackmount format differs from the Digitus rack or tower convertible pack
Check price at PCHub

Prices shown reflect the available listing details and can change. Check stock, delivery, compatibility and full product specifications with PCHub before ordering.