APC by Schneider Electric SYRMXR4B4 4U Rack Battery Module
Overview
The SYRMXR4B4 is a 4U rack-mount battery module from APC by Schneider Electric's RM Series, designed to expand or replace battery capacity in compatible rack-mount UPS systems operating at 208/240V AC. It occupies 4 rack units in a standard 19-inch enclosure — meaning it fits cleanly into existing equipment racks without requiring a separate battery cabinet or floor footprint. The maintenance-free sealed lead-acid chemistry with suspended electrolyte means no venting concerns and no periodic water topping, which matters in data closets and equipment rooms where serviceability access is limited.
Key Features
- Maintenance-Free Sealed Lead-Acid with Suspended Electrolyte: The leakproof construction eliminates the need for electrolyte checks or top-offs, reducing ongoing maintenance overhead in rack environments where hands-on servicing is infrequent.
- 4U 19-Inch Rack Form Factor: At 4 rack units tall in a standard 19-inch chassis (17.8H × 48.3W × 64D cm), the SYRMXR4B4 integrates into existing equipment racks without requiring floor space or auxiliary enclosures — a practical advantage in space-constrained server rooms and communications closets.
- 208/240V AC Compatibility: Rated for 208/240V AC input, this module is suited for three-phase-adjacent or high-voltage single-phase installations typical of larger rack UPS deployments in commercial and industrial environments.
- Black Rack Finish: Standard black finish aligns with most commercial rack installations, requiring no cosmetic modifications in mixed-vendor rack environments.
Integration and Compatibility
The SYRMXR4B4 is part of APC's RM Series battery line. Verify compatibility against your specific UPS model before ordering — APC rack battery modules are model-matched, and using the wrong module can result in reduced runtime or failed initialization. Cross-reference the UPS model's external battery compatibility list or consult the UPS installation guide. For broader power protection planning, confirm the number of external battery modules your UPS chassis supports and whether additional battery management modules are required. See the UPS batteries and accessories category for related components.
Frequently Asked Questions
Q: What rack space does the SYRMXR4B4 require?
A: The SYRMXR4B4 occupies 4U (four rack units) in a standard 19-inch rack. Physical dimensions are 17.8H × 48.3W × 64D cm.
Q: What voltage is the SYRMXR4B4 rated for?
A: The SYRMXR4B4 is rated for 208/240V AC — appropriate for larger rack UPS systems operating at higher voltage, common in commercial data center and industrial environments.
Q: Is the SYRMXR4B4 maintenance-free?
A: Yes. It uses a sealed lead-acid battery with suspended electrolyte — leakproof construction that requires no water topping, venting, or periodic electrolyte maintenance.
Q: What battery chemistry does the SYRMXR4B4 use?
A: Sealed lead-acid with suspended electrolyte. This is a well-established UPS battery chemistry offering leakproof operation suitable for indoor rack environments.
Q: Is the SYRMXR4B4 a universal fit for any APC UPS?
A: No — APC battery modules are model-matched. Always verify compatibility with your specific UPS model number before ordering. Consult the UPS installation guide or APC's compatibility reference for the correct external battery module list.
The SYRMXR4B4 is a straightforward 4U rack battery module — the key spec to anchor on here is the 208/240V AC rating, which immediately tells you this is not a standard 120V desktop-UPS battery. It belongs in higher-voltage rack UPS deployments: think larger Symmetra RM or Smart-UPS RT chassis running 208V single-phase in a commercial equipment room or edge data closet.
Technical Highlights:
- Sealed Lead-Acid, Suspended Electrolyte: Leakproof construction means no spill risk and no ventilation requirement beyond normal rack airflow — appropriate for enclosed rack environments where battery maintenance access is limited or infrequent.
- 4U / 19-Inch Rack Integration: The 17.8H × 48.3W × 64D cm chassis slides into any standard 19-inch rack bay. At 64cm deep, verify rack depth clearance before ordering — shallow two-post racks may not accommodate the full module depth.
- 208/240V AC Rating: Confirms this module is designed for high-voltage rack UPS chassis, not entry-level 120V systems. Mismatching voltage tiers is the most common ordering error on APC battery modules.
Deployment Considerations:
- Confirm your UPS model explicitly lists the SYRMXR4B4 as a supported external battery module — APC's compatibility is model-specific, not series-wide. Two RM Series UPS units at the same voltage can still require different battery modules.
- At 64cm depth, shallow or open-frame two-post racks may not provide adequate rear support. Plan for a four-post rack or a rack rail kit rated for the module weight before installation.
The SYRMXR4B4 fits best in commercial equipment rooms and edge data closets running 208V rack UPS systems where maintenance-free battery operation and clean rack integration are priorities over compact footprint.
