APC by Schneider Electric APC Smart-ups X-series - SMX48RMBP2U

APC by Schneider Electric SMX48RMBP2U 48V External Battery Pack Rack/Tower 2U

Overview

The SMX48RMBP2U is a 48V sealed lead-acid external battery pack engineered to extend runtime on APC Smart-UPS X series uninterruptible power supplies. Housed in a 2U (89 mm tall) chassis that ships ready for standard 19-inch rack deployment, it can also be reoriented for tower use — giving you flexibility whether you're mounting in a server rack, a network cabinet, or setting it on a shelf in a wiring closet. If your current UPS runtime doesn't cover the shutdown window your IT or facilities team needs, this battery pack is how you close that gap without replacing the UPS itself.

Two valve-regulated lead-acid (VRLA) batteries sit inside a 432 mm wide × 490 mm deep enclosure — measure your rack depth before ordering, as 490 mm is on the longer end and shallower two-post racks may not accommodate it without a shelf. At 35.5 kg packaged, plan for a two-person lift during installation.

Key Features

• 48V VRLA Battery Technology: Sealed lead-acid chemistry means no electrolyte maintenance and no venting requirements — you can rack this unit in a standard server room without special ventilation provisions. VRLA batteries are also spill-proof, which matters in mixed-use equipment rooms.
• Hot-Swap Capable: Batteries can be replaced while the UPS remains online and load-connected. In 24/7 environments — data centers, surveillance head-end rooms, network operations centers — this eliminates the planned maintenance window that a cold-swap would otherwise require. Battery replacement becomes a routine task, not a scheduled outage.
• 2U Rack-Mount Form Factor: At 89 mm tall (2U) and 432 mm wide, the SMX48RMBP2U fits any standard EIA 19-inch rack. The same unit converts to tower orientation, so it works equally well in a telco closet standing next to the UPS it's paired with.
• 5-Year Battery Service Life: The specified battery life of 5 years is longer than the 3-year replacement cycle common on entry-level UPS batteries. For installations where reaching into a rack to swap batteries is disruptive or labor-intensive — remote sites, locked comms rooms, high-density racks — a longer service interval reduces total cost of ownership in a way that's easy to quantify.
• RoHS, REACH, and EOLI Compliance: RoHS restricts hazardous substances (lead, mercury, cadmium, etc.) in electrical equipment — relevant if you're deploying in EU markets or have corporate environmental standards. REACH compliance covers chemical substance disclosure. EOLI (End of Life Instructions) compliance signals documented recycling/disposal pathways, which matters for enterprise sustainability reporting.
• Low Carbon Footprint Documentation: A verified total carbon footprint of 162.55 kg CO2e is published for this SKU — useful for organizations tracking Scope 3 emissions or meeting procurement sustainability criteria without doing the calculation themselves.
• Dual Battery Configuration: The two-battery internal configuration at 48V delivers the capacity needed to meaningfully extend runtime on mid-range Smart-UPS X loads. Multiple packs can typically be daisy-chained on compatible UPS models, letting you scale runtime incrementally as needs grow rather than buying a larger UPS upfront.

Integration and Compatibility

The SMX48RMBP2U is designed for the APC Smart-UPS X series product line, which uses a 48V external battery interface. Confirm compatibility against your specific UPS model number before ordering — APC's Smart-UPS X family spans several voltage tiers, and selecting a mismatched battery pack voltage is the most common installation error with external battery packs. This unit is intended for UPS and power protection deployments in IT infrastructure, security head-end rooms, and network distribution environments.

For NVR and video surveillance infrastructure deployments, pairing an appropriately sized Smart-UPS X with one or more SMX48RMBP2U packs is a practical way to meet the runtime requirements that insurance and compliance audits often specify for security systems — typically 15–30 minutes at full load. For broader rack power planning, review a UPS runtime and battery selection guide to size correctly for your load profile.

The 490 mm depth of this unit is a real constraint — verify your rack's usable depth (front-to-rear between mounting rails) before specifying. Many two-post open-frame racks have less usable depth than a 19-inch four-post closed rack, and this pack will not fit in shallower enclosures without an extension shelf. Also check that your rack enclosure can support the additional weight; 35.5 kg packed weight means roughly 28–30 kg installed, and that load must be accounted for in your rack's weight capacity.

Frequently Asked Questions

Q: What APC UPS models is the SMX48RMBP2U compatible with?

A: The SMX48RMBP2U is designed for the APC Smart-UPS X series that supports a 48V external battery connection. Confirm your specific UPS model number against APC's compatibility matrix — the Smart-UPS X family spans multiple voltage configurations, and only 48V-interface models will work with this pack.

Q: Can the batteries be replaced without powering down the connected UPS?

A: Yes. The SMX48RMBP2U supports hot-swap battery replacement, meaning batteries can be swapped while the UPS is running under load. This is one of the primary reasons to specify this unit in 24/7 environments where a maintenance window for a cold swap is not practical.

Q: Does the SMX48RMBP2U fit in a standard 19-inch server rack?

A: Yes — it is 432 mm wide (standard 19-inch rack width) and 89 mm tall (2U). However, the depth is 490 mm, which is on the longer side. Verify your rack's usable front-to-rear depth before ordering. It also converts to tower orientation if rack mounting is not an option.

Q: What battery technology does the SMX48RMBP2U use, and does it require special ventilation?

A: It uses Sealed Lead Acid (VRLA) batteries. VRLA batteries are sealed and valve-regulated — they do not require dedicated venting or special ventilation provisions in a standard server room or equipment closet, unlike flooded lead-acid batteries.

Q: Is the SMX48RMBP2U RoHS compliant?

A: Yes. The SMX48RMBP2U carries RoHS compliance as well as REACH and EOLI certifications, making it suitable for deployments in EU-regulated markets and for organizations with environmental substance-restriction procurement requirements.

Q: How long should the batteries last before replacement?

A: APC specifies a 5-year battery service life for the SMX48RMBP2U. Actual service life depends on ambient temperature, cycle frequency, and load conditions — operating in warmer environments above 25°C will shorten battery life, as is standard for all lead-acid chemistry.

Ted Perry

The SMX48RMBP2U is a straightforward spec decision once you know your UPS model and your rack depth. The 48V VRLA configuration and hot-swap capability are the two specs that determine whether this pack fits your operational model — and for most 24/7 infrastructure environments, both check out. Where I see installations go sideways is on that 490 mm depth: integrators pull the trigger before measuring the rack, and then they're either ordering a shelf or sending the pack back.

Technical Highlights:

• Hot-Swap Battery Design: Batteries are replaceable under load — no UPS shutdown, no load transfer to bypass. For surveillance head-end rooms or network closets where a 10-minute outage would drop recording on 50+ cameras, this is not optional; it's the spec that justifies the purchase.
• 5-Year Rated Battery Life: The 5-year service interval versus the 3-year cycle on cheaper alternatives means fewer rack intrusions, lower maintenance labor costs, and less battery waste over a 10-year infrastructure lifecycle.
• VRLA Sealed Chemistry: No electrolyte maintenance, no venting requirement. Installs like any other rack unit in a standard server room — no special handling beyond the 35.5 kg packaged weight, which requires a two-person lift.

Deployment Considerations:

• Verify rack usable depth against the 490 mm body depth before specifying. Shallow two-post racks and some half-depth wall-mount enclosures will not accommodate this unit without an extension shelf or bracket.
• The 35.5 kg packaged weight (roughly 28–30 kg installed) must be accounted for in your rack's weight capacity, particularly if you are stacking multiple packs on adjacent rack units to extend runtime further.

For security operations centers, remote surveillance sites, or network distribution rooms where runtime extension beyond the base UPS is the primary need and maintenance access is infrequent, the SMX48RMBP2U's 5-year battery life and hot-swap design make it the right specification — provided the rack geometry works out.