





APC Accessories · External Battery Packs
APC Smart-UPS X External Battery Pack
External battery packs from APC's Smart-UPS X range, in four variants: SMX48RMBP2U and SMX48RMBP2US at 48 V and 864VAh, SMX120BP at 120 V and 1200VAh, and SMX120RMBP2U at 120 V. Each is a rack-mounted lead-acid battery in an enclosed battery cartridge, and each carries a 24-month warranty in APC's data. APC lists SMX1500RMI2U and SMX1500RMI2UNC as compatible UPS for the 48 V packs, and Smart-UPS SMX extended runtime models above 2kVA for SMX120RMBP2U. Supplied by AtomOffice in Dubai with same-day delivery in Dubai, next-day across the UAE, and a VAT invoice on every order.
Quick Glance
Key Features
48 V and 120 V Variants
SMX48RMBP2U and SMX48RMBP2US are 48 V, 864VAh. SMX120BP and SMX120RMBP2U are 120 V; APC states 1200VAh for SMX120BP and gives no VAh figure for SMX120RMBP2U.
Enclosed Lead-Acid Cartridge
Every variant is listed as a lead-acid battery in an enclosed battery cartridge, rack-mounted. SMX48RMBP2U, SMX48RMBP2US and SMX120RMBP2U are 2U; SMX120BP is 4U.
Up to 10 Packs on SMX120RMBP2U
APC's SMX120RMBP2U listing says it supports combining up to 10 battery packs with the UPS for extended runtime. Tell us your UPS and target runtime and we will confirm what suits it.
Detailed Specifications
Specifications from Schneider Electric’s product data (se.com, UAE). Ask us and we will confirm any value against the unit.
Need-to-Know
Four variants share this page across two voltages (48 V and 120 V) and two rack sizes (2U and 4U). Compare voltage, capacity and rack size to find the pack for your UPS.
- Confirm compatibility with your exact Smart-UPS X model before ordering. APC lists SMX1500RMI2U and SMX1500RMI2UNC as compatible UPS for the 48 V packs, and Smart-UPS SMX extended runtime models above 2kVA for SMX120RMBP2U. APC's listing for SMX120BP names no compatible UPS.
- Voltage differs by variant: 48 V on SMX48RMBP2U and SMX48RMBP2US, 120 V on SMX120BP and SMX120RMBP2U. Tell us your UPS model and we will confirm which pack applies.
- SMX48RMBP2US is listed as the TAA version of the 48 V, 864VAh pack. Its APC listing does not show provided equipment, while SMX48RMBP2U, SMX120BP and SMX120RMBP2U list an installation guide and rack mounting brackets.
- APC lists replacement battery APCRBC115 for SMX48RMBP2U and SMX48RMBP2US, and says a replacement battery is available for SMX120RMBP2U.
- APC lists the AP9625 2-post rail kit as compatible mounting for SMX48RMBP2U, SMX48RMBP2US and SMX120RMBP2U.
| Model | Voltage | Capacity | Rack size |
|---|---|---|---|
| SMX48RMBP2U | 48 V | 864VAh | 2U |
| SMX120BP | 120 V | 1200VAh | 4U |
| SMX120RMBP2U | 120 V | — | 2U |
| SMX48RMBP2US | 48 V | 864VAh | 2U |
Confirm compatibility with your exact SMX model before ordering. APC gives no capacity figure for SMX120RMBP2U.
Best For / Customer Benefits
Customer Benefits
- Four variants cover 48 V and 120 V external battery packs for Smart-UPS X (SMX) units.
- Each variant is a rack-mounted lead-acid battery in an enclosed battery cartridge.
- APC states SMX120RMBP2U supports combining up to 10 battery packs with the UPS for extended runtime.
- 24-month warranty on every variant in APC's data.
Best For
Frequently Asked Questions
These are Smart-UPS X-Series external battery packs. APC lists SMX1500RMI2U and SMX1500RMI2UNC as compatible UPS for the 48 V packs, and Smart-UPS SMX extended runtime models above 2kVA for SMX120RMBP2U. Send us your UPS model and we will confirm before you order.
The pack voltage is 48 V for SMX48RMBP2U and SMX48RMBP2US, and 120 V for SMX120BP and SMX120RMBP2U. Tell us your exact UPS model and we will confirm the right variant before you order.
APC's listing for SMX120RMBP2U says it supports combining up to 10 battery packs with the UPS for extended runtime. The other listings do not state a limit, so tell us your UPS model and target runtime and we will confirm.
SMX48RMBP2US is listed as the TAA version of the 48 V, 864VAh pack; both list a 2U body, a lead-acid battery and 24 months of warranty. The SMX48RMBP2US listing shows no provided equipment, whereas SMX48RMBP2U lists an installation guide and rack mounting brackets.
APC lists 24 months for all four variants. Ask us to confirm the warranty terms when you order.
Need an external battery for a Smart-UPS X?
Tell us your exact SMX model and the runtime you're targeting, and our UAE team will confirm which pack suits it and current stock.

