APC by Schneider Electric SMX120RMBP2U External Battery Pack 2U Rack/Tower
Overview
The APC by Schneider Electric SMX120RMBP2U is a 2U rack/tower external battery pack designed to extend runtime on compatible Smart-UPS SMX-series systems. It operates at 120VDC and uses a sealed lead-acid chemistry, making it a direct-connect capacity expansion — not a standalone UPS. If your protected load needs more bridge time than the internal battery provides, this pack slots into the same rack footprint and plugs directly into the host UPS without additional power conversion hardware.
For IT closets, security head-end racks, and network equipment rooms where downtime has real operational cost, runtime extension is often the deciding factor between a graceful shutdown and an abrupt one. The SMX120RMBP2U addresses that gap in a standard 2U enclosure that fits most 19-inch rack cabinets or can be deployed in tower orientation alongside a tower-mode UPS.
Key Features
- 2U Rack/Tower Form Factor: At 17 inches wide and occupying just 2U of rack space, this pack integrates cleanly into existing rack infrastructure. No dedicated shelf or custom bracket is needed — it mounts in any standard 19-inch EIA rack alongside network switches, NVRs, or access control servers.
- 120VDC Lead-Acid Battery Chemistry: Sealed lead-acid is the proven workhorse chemistry for UPS applications — low self-discharge, no memory effect, field-replaceable cells, and predictable end-of-life behavior. You know when it's time to replace; it doesn't fail without warning the way some lithium chemistries can in enterprise environments.
- Extended Runtime for SMX-Series UPS: Adding this pack to a compatible Smart-UPS SMX host multiplies the available runtime at load. The practical value depends on your load wattage — lighter loads (network gear, access control panels, IP camera POE switches) see the largest runtime gains per added battery pack.
- Black Finish, Rack-Integrated Appearance: The black enclosure matches standard rack equipment aesthetics. In customer-facing or audited server rooms, a uniform rack appearance matters for professional presentation and equipment identification.
- ECCN 5D992 Classification: This unit carries an Export Control Classification Number of 5D992, which is a low-restriction classification. For organizations with export compliance programs, this is relevant when deploying to international sites or shipping as part of a larger integrated system order.
- Direct UPS Integration — No Additional Configuration: External battery packs in the SMX family connect directly to the host UPS, which automatically detects and accounts for the additional capacity. No manual runtime recalculation or firmware update is typically required — the UPS management interface reflects the updated runtime estimate once the pack is connected and charged.
Integration and Compatibility
The SMX120RMBP2U is designed for use with APC Smart-UPS SMX-series units that support external battery pack expansion. Before purchasing, confirm that your specific SMX host model lists this pack as a compatible accessory — not all SMX units accept external battery packs, and mixing non-matched packs can result in the host UPS not recognizing the additional capacity. Consult the UPS batteries and power protection category for compatible host units.
For security and surveillance installations, this pack is particularly useful behind head-end equipment — NVRs, PoE switches, and access control servers — where extended runtime during a power event means cameras continue recording and doors continue operating on their programmed schedules. Pair it with a properly sized uninterruptible power supply for a complete protected power architecture.
Integrators designing rack systems for physical security deployments should account for the additional weight a lead-acid battery pack adds to the rack. Battery packs are among the heaviest rack components — factor this into floor loading and rack anchoring decisions, especially in seismically active regions or mobile deployments.
For broader APC power infrastructure options, browse the full APC by Schneider Electric catalog, which includes UPS units, PDUs, and rack enclosures suited to commercial security and IT environments. If you're sizing a complete power protection system from scratch, the power protection section covers the full selection.
Frequently Asked Questions
Q: Is the SMX120RMBP2U a standalone UPS, or does it require a host UPS?
A: It is an external battery pack only — not a standalone UPS. It must be connected to a compatible APC Smart-UPS SMX-series host unit to function. It provides no power conditioning or inverter capability on its own.
Q: What battery chemistry does the SMX120RMBP2U use?
A: It uses sealed lead-acid battery chemistry at 120VDC. Lead-acid is a well-established chemistry for UPS applications with predictable capacity degradation and field-replaceable cells.
Q: Will the SMX120RMBP2U fit in a standard 19-inch rack?
A: Yes. It is a 2U rack-mountable enclosure measuring 17 inches wide, compatible with standard 19-inch EIA rack cabinets. It can also be deployed in tower orientation alongside a tower-mode UPS.
Q: Does the SMX120RMBP2U work in tower orientation as well as rack?
A: The product is rated for both rack and tower deployment, giving you flexibility if your installation environment changes or if the host UPS is deployed in tower mode.
Q: What is the ECCN for the SMX120RMBP2U?
A: The ECCN is 5D992, which is a low-restriction export classification. This is relevant for organizations that manage export compliance across international deployments or multi-site security installations.
The SMX120RMBP2U is a straightforward runtime-extension decision: if your SMX host's internal battery doesn't carry your protected load long enough for a controlled shutdown or a generator to start, this 120VDC lead-acid pack in a 2U chassis is the direct answer. It is not a replacement UPS and it is not a universal battery — confirm SMX compatibility for your specific host model before the order goes in.
Technical Highlights:
- 120VDC Lead-Acid Chemistry: Sealed VRLA cells at 120VDC match the SMX host's battery bus directly — no DC-DC conversion stage in the path, which means no conversion losses and no additional failure points between the battery and the inverter.
- 2U Rack/Tower Dual Orientation: The 2U form factor keeps the battery expansion collocated with the UPS in the same rack, simplifying cable management and keeping the DC connection short. Short DC runs matter — long runs at high current introduce resistance losses that reduce effective capacity.
- ECCN 5D992 Classification: Low-restriction classification means standard EAR99-adjacent export handling for most destinations. If you're shipping integrated rack systems internationally as part of a security installation contract, this classification streamlines the compliance paperwork.
Deployment Considerations:
- Lead-acid battery packs are heavy — account for rack weight loading before specifying the rack unit. Battery weight is frequently underestimated in rack designs until the floor or the rack rails complain.
- The host SMX UPS must explicitly support this pack; not all SMX models accept external battery expansion. Verify compatibility against APC's SMX compatibility matrix before purchase — a non-matched connection may result in the pack being unrecognized.
For security operations centers and remote IDF closets protecting NVR and PoE switch infrastructure, the SMX120RMBP2U is the right component when the host UPS is already correctly sized for load and only runtime extension — not additional capacity — is what the deployment requires.
