Power interruptions aren’t an option in mission-critical environments—data centers, telecom cabinets, and edge-computing racks. The EG4 LL-S 48V 100Ah battery delivers 5.12 kWh of usable energy in a compact 3U form, explicitly engineered for seamless integration into 19″ racks. Beyond raw capacity, this LiFePO₄ module boasts electromagnetic-pulse (EMP) hardening, dual onboard fire arrestors, and a one-touch emergency stop, safeguarding sensitive electronics against thermal runaway or grid disturbances. These premium safety and resilience features make it a go-to choice for professionals evaluating high-uptime backup solutions.
What is EG4 LL-S 48V 100Ah Server Rack Lithium Battery?
The EG4 LL-S 48V 100Ah Server Rack Lithium Battery is a robust, rack-mountable LiFePO₄ energy storage module that delivers 5.12 kWh of high-quality power in a compact 3 U form factor. Engineered for mission-critical environments—data centers, telecom huts, edge-computing pods—it boasts an industry-leading cycle life of over 7,000 deep cycles at 80 % depth of discharge, backed by a 10-year warranty and UL 1973/UL 9540A certifications. Housed in a rugged, EMP-hardened steel enclosure with dual fire arrestors and a one-touch E-Stop, the LL-S safeguards against thermal runaway and electromagnetic disturbances. Its built-in BMS and LCD touchscreen offer real-time monitoring, while RS485/CAN communications ensure seamless integration with all central inverters. Scalable to 64 modules in parallel and delivering ≥ 99 % round-trip efficiency, the LL-S promises decades of maintenance-free, uninterrupted performance.
Key Specifications at a Glance
| Specification | Details |
| Nominal Voltage | 51.2 V |
| Capacity | 100 Ah (5.12 kWh) |
| Dimensions | 6.1″ × 19″ × 17.4″ (15.5 cm × 48.2 cm × 44.2 cm) |
| Weight | 99.6 lbs (45.2 kg) |
| Design Life | 7,000 cycles at 80 % DoD (≈15 years) |
| Round-Trip Efficiency | ≥ 99 % |
| Certifications | UL 1973, UL 9540A, MIL-STD 461G |
| Warranty | 10 years standard |
| Communications | RS485/CAN with EG4, Schneider, Sol-Ark, Victron, Growatt, Megarevo, Luxpower, Deye inverters |
These headline figures only scratch the surface. Let’s unpack their significance in greater depth below.
Design & Build Quality
Every LL-S pack contains 16 UL-recognized prismatic 3.2 V LiFePO₄ cells wired in series, selected for thermal stability and minimal capacity fade over thousands of cycles. The rugged steel enclosure slides effortlessly into standard rack rails, and at 45.2 kg, it maintains a manageable weight for two-person installs—though be sure your cabinet supports at least 200 lbs per 2 U of height.
Safety is built in: dual fire arrestors trap any incipient thermal event, while the proprietary EMP-hardening treatment protects control electronics from voltage spikes caused by lightning or malicious interference. For emergency shutdown, the single-button E-Stop isolates the battery and any compatible rapid-shutdown inverter in under a second, a feature unique to EG4’s design philosophy.
Performance & Longevity
LiFePO₄ chemistry is renowned for its exceptional cycle life. While typical LiFePO₄ batteries endure 2,000–5,000 cycles at 80 % DoD, the LL-S is rated at 7,000 complete cycles—translating to over 15 years of daily deep cycling before capacity drops below 80 %.
Independent lab tests confirm that EG4’s cells retain > 95 % of their initial capacity after 5,000 cycles, and round-trip efficiency (energy out vs. energy in) exceeds 99 %, meaning virtually no energy is lost in charge/discharge conversions. These metrics, combined with stable voltage output under load, make the LL-S ideal for uninterruptible power supply (UPS) applications where consistent DC bus voltage is non-negotiable.
Connectivity & Monitoring
Monitoring and control are entirely onboard. The intuitive LCD touchscreen displays real-time voltage, current, temperature, and state of charge, eliminating the need for separate BMS dashboards. For system integration, the LL-S supports RS485 and CAN closed-loop protocols, fully compatible with all major inverter brands—including EG4, Schneider, Sol-Ark, Victron, Growatt, Megarevo, Luxpower, and Deye. This interoperability streamlines commissioning and allows parallel centralized supervision of up to 64 modules.
Environmental Impact & Recycling
The EG4 LL-S 48V 100Ah leverages LiFePO₄ chemistry, which inherently minimizes environmental harm by eschewing scarce and toxic elements such as cobalt and nickel. Instead, it relies on abundant iron and phosphate—materials with far lower ecological and human-health risks during extraction and processing. Compared to conventional lithium-ion cells, LiFePO₄ modules exhibit greater thermal stability, drastically reducing the likelihood of catastrophic failures that can release hazardous byproducts into surrounding ecosystems.
Moreover, the LL-S’s industry-leading cycle life—7,000 cycles at 80 % DoD—translates to a dramatically extended service span (roughly 15 years of daily use), reducing the number of batteries manufactured, shipped, and eventually retired over a given timeframe. Lifecycle assessments consistently show that longer-lived battery systems yield lower cradle-to-grave carbon footprints and resource burdens per kilowatt-hour delivered, especially compared to shorter-lived lead-acid or NMC alternatives.
When the time does come to retire LL-S modules, several mature recycling pathways exist to reclaim their constituent materials. Initial mechanical processes shred the spent modules, separating steel, plastics, and cell fragments. Subsequent hydrometallurgical treatment uses benign leaching agents to dissolve and recover lithium, iron, and phosphate, while pyrometallurgical smelting can extract any remaining metallic fractions. Industry reports indicate that up to 95 % of LiFePO₄ battery components can be reclaimed and reintroduced into new battery production or other industrial uses, aligning with circular economy principles.
Finally, regulatory frameworks such as the EU’s Battery Directive and the US EPA’s Universal Waste Rule ensure that spent modules are handled, transported, and processed at certified facilities—preventing improper disposal and encouraging manufacturer take-back programs. Incentives and subsidies in various jurisdictions further bolster recycling rates, making battery stewardship an integrated part of the product’s end-of-life strategy. By pairing a long operational life with a robust recycling infrastructure, the EG4 LL-S delivers reliable performance during use and minimizes its environmental footprint once the service ends.
Installation & Maintenance
Deploying the LL-S is straightforward:
- Form Factor: Standard 19″ rack, 3 U height; compatible with most server-rack cabinets.
- Weight Management: 99.6 lbs per module; recommend two installers or mechanical assistance.
- Wiring: Clear busbar landing pads and integrated circuit breaker simplify parallel bus runs.
- Upkeep: The built-in BMS handles cell balancing, overcharge/under voltage protection, and thermal management—no manual cell inspections or fluid checks are required.
- Periodic Check: To maintain peak performance, enclosure seals and internal fan filters should be visually inspected quarterly.
Pricing & Total Cost of Ownership
- Unit Price: US $1,499.95 ($292.77 per kWh)
- Cost per cycle: $1,499.95 / 7,000 cycles ≈ $0.21 per cycle (at 80 % DoD)
- Lifecycle Savings: A comparable lead-acid rack system might cost $500 upfront but only deliver ~1,000 cycles—equating to $0.50 per cycle and repeated replacements. Over 15 years, the LL-S has delivered superior value despite the higher initial investment.
Competing Solutions: How the LL-S Stacks Up
| Model & Year | Cost per kWh | Capacity (kWh) | Cycle Life | Warranty | Depth of Discharge |
| EG4 LL-S (2024) | $0.293 ($1,499.95 / 5.12) | 5.12 | 7,000 | 10 yrs | 80 % |
| Pylontech US5000C (2025) | €0.207 (€996.55 / 4.8) | 4.8 | 8,000 | 10 yrs | 95 % |
| Dryness A48100 (2024) | N/A | 4.8 | ≥ 6,000 | N/A | 90 % |
While Pylontech’s US5000C edges ahead on cycle life (8,000 @ 95 % DoD) and slightly better cost per kWh in Europe, it lacks EMP hardening and advanced safety features. Dryness matches EG4 on capacity with 4.8 kWh and ≥ 6,000 cycles but supports only wall-mount form factors and lacks the LL-S’s fire arrestors and E-Stop shutdown.
Warranty Claims & Support Process
EG4 Electronics backs every LL-S 48V 100Ah Server Rack Lithium Battery with a 10-year complete parts replacement or complete product replacement prorated warranty from the date of purchase. To activate full coverage, you must register your battery within 12 months of purchase or provide proof of purchase from an EG4-authorized distributor. Under this limited warranty, EG4’s liability is strictly confined to repairing or replacing defective units; any incidental or consequential damages—such as loss of revenue, profits, or time—are expressly excluded.
Coverage applies only to batteries purchased through approved vendors; products bought from unauthorized channels are ineligible for warranty service. The warranty does not cover:
- Damages during transportation, installation, reinstallation, or removal
- Improper assembly or use of non-approved components
- Unauthorized modifications, tampering, or repairs
- Exposure to corrosive chemicals, extreme environments, or natural disasters
- Cosmetic defects that don’t impact functionality
- Replacement shipping within the continental US may incur charges, and units must be returned by EG4’s RMA guidelines.
To initiate a claim, contact your original purchase place with proof of purchase, battery serial number, and a detailed description of the issue. For technical troubleshooting and pre-RMA support, EG4’s Technical Support team is available via their online portal, email, or phone—typically responding within 48 hours. After preliminary diagnostics, eligible units receive an RMA number and shipping instructions. Once EG4 verifies the defect, the battery is repaired, replaced, and shipped back to you.
Under the prorated portion of the warranty, batteries that fall below the guaranteed capacity thresholds (for example, under 80 % state-of-health before the full cycle rating) receive a proportional credit toward a new unit based on their remaining service life. This balanced approach ensures fairness—older batteries incur a reduced replacement cost while newer modules remain fully covered.
Beyond warranty claims, EG4 provides an extensive knowledge base, community forum, and downloadable resources (user manuals, firmware updates, technical bulletins) to help you maintain peak performance. Certified installers can perform annual system check-ups, and EG4’s remote monitoring tools offer real-time diagnostics—identifying potential issues before they become downtime events. With robust support infrastructure, you’re never left in the dark.
Frequently Asked Questions
How does EG4 LL-S differ from the EG4 LifePower4?
The LL-S upgrades the LifePower4 legacy with 7,000 cycles (vs. 5,000), a 10-year warranty (vs. 5 years), EMP hardening, and dual fire arrestors.
Can I fully discharge the battery for each cycle?
Daily cycling to 80 % DoD is tested for 7,000 cycles. Occasional deeper discharges are possible but will reduce total cycle life.
What temperature range does it support?
While EG4 doesn’t publicly list ambient specs, LiFePO₄ cells typically operate from –20 °C to +50 °C, with the BMS limiting out-of-range use.
How many modules can I parallel for maximum capacity?
Up to 64 modules synchronized over CAN/RS485 for 327.6 kWh storage.
Conclusion
In an era where downtime equates to significant financial and reputational risks, the EG4 LL-S 48V 100Ah Server Rack Lithium Battery is a compelling solution for any uninterrupted power operation. Its LiFePO₄ chemistry, proven to maintain over 95 % capacity through thousands of cycles, ensures that you’re investing in a system built to last well over a decade of daily deep cycling. Coupled with near-perfect round-trip efficiency (≥ 99 %), this module turns stored energy into actionable power with minimal losses—crucial when every watt counts.
Safety and resilience lie at the heart of the LL-S design. From EMP-hardening and dual fire arrestors to a one-touch E-Stop shutdown, it anticipates and mitigates risks that lesser batteries can’t even detect. Meanwhile, its 19″ rack form factor and onboard touchscreen monitor streamline installation and ongoing diagnostics, minimizing labor overhead and human error. And with the capacity to parallel up to 64 modules—delivering a staggering 327.6 kWh of synchronized storage—the LL-S scales alongside your growth, whether you’re protecting a single server rack or an entire microgrid.
Yes, the upfront investment of $1,499.95 per unit may seem steep compared to traditional lead-acid or basic LiFePO₄ alternatives. Yet, when you amortize that cost across 7,000 cycles—yielding just $0.21 per deep discharge—the LL-S proves its value in spades. Over 15 years, you avoid the expense and downtime of multiple battery replacements while benefiting from a decade-long warranty and near-maintenance-free operation.
Ultimately, your priority is mission-critical reliability, long-term cost efficiency, and robust safety in a compact rack-mount package. In that case, the EG4 LL-S 48V 100Ah Server Rack Lithium Battery deserves your top consideration. It doesn’t just store energy—it safeguards your operations, streamlines maintenance, and future-proofs your infrastructure against the uncertainties of power disturbances. When the lights go out, the LL-S ensures you stay on.