Product Type | External Lithium-Ion Battery Pack |
Form Factor | Rack-mountable (1U) |
Battery Type | Lithium-ion |
Compatible UPS Models | Smart-UPS Ultra SRTL2K2 and SRTL3K |
Enclosure Color | Silver grey |
Weight | 43 lbs. |
Nominal Battery Voltage | Internal to UPS – dependent on UPS model; external battery pack has no separate voltage output |
Typical Recharge Time | Under 3 hours (with compatible UPS) |
Expected Battery Life | 8-10 years (at 25°C) |
Battery Mounting Type | Hot-swappable and field-replaceable (with UPS support) |
Expansion Capability | Supports multiple external battery packs per UPS model limitations |
Warranty | 5-year repair or replace |
APC Smart-UPS Ultra 1U Lithium-Ion Battery Pack, Model SRTL50RMBP1U-LI


Key Benefits

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- Optimized for Smart-UPS Ultra SRTL2K2 and SRTL3K models, ensuring seamless integration
- Lithium-ion technology offers better performance and lifespan than VRLA alternatives, maximizing ROI
- 5-year standard warranty provides long-term investment protection and support assurance
Product Overview
The APC Smart-UPS Ultra 1U RM Lithium-Ion Battery Pack (SRTL50RMBP1U-LI) is engineered to enhance power reliability for Smart-UPS Ultra SRTL2K2 and SRTL3K systems. Designed with efficient lithium-ion battery technology, it offers a longer lifecycle, faster charge rates, and superior temperature tolerance compared to traditional VRLA batteries. Its slim 1U rackmount form factor helps conserve valuable rack space while still delivering powerful energy backup for critical infrastructure.
This battery pack features a silver grey enclosure and is manufactured in Taiwan with TAA compliance, making it suitable for government and commercial procurement. It operates efficiently within a 0 to 40 degrees Celsius range and supports 0–95% non-condensing humidity, making it a resilient component for diverse IT environments. Its total weight is 43 lbs., and with dimensions of 17.008 inches in width and 22.05 inches in depth, it integrates seamlessly into compatible racks.
Backed by a robust 5-year repair or replace warranty, this battery pack represents a long-term power solution for businesses requiring uninterrupted operation. It is ideal for data centers, remote edge deployments, and enterprise-level UPS users looking for compact, high-performance battery expansion options.
Specifications
Product Overview
Wireless Features
Wireless Capability |
Compliance & Origin
Country of Origin | Taiwan |
TAA Compliant | Yes |
RoHS Compliant | Yes |
Certifications | UL 1973, CE, FCC Part 15 Class A, ENERGY STAR qualified (when connected to certified UPS) |
Advanced Security Features
Tamper-Resistant Enclosure | Yes |
Security Monitoring | Via host UPS if supported |
Interfaces
Battery Connector Type | Proprietary APC connector to Smart-UPS Ultra models |
Communication | Through host UPS unit |
Physical & Environmental
Width | 17.008 Inches |
Depth | 22.05 Inches |
Height | 1.7 Inches |
Mounting | Rack-mountable (standard 19-inch racks) |
Operating Temperature Range | 0 to 40 °C |
Operating Humidity | 0-95% non-condensing |
Storage Temperature Range | -15 to 45 °C |
Storage Relative Humidity | 0-95% non-condensing |
Operating Elevation | 0-3000 meters |
Storage Elevation | 0-15000 meters |
Acoustic Noise at 1m from Surface |
Cloud Management & Licensing
Cloud Management | Through compatible UPS with SmartConnect (if supported) |
Remote Battery Monitoring | Via compatible UPS and connected software |
SmartSlot Compatibility | Yes, if connected to expanding UPS system |
Software Support | APC PowerChute, EcoStruxure IT |