• V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • 48V (51.2V) 100Ah 3U Server Rack LiFePO4 Battery
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • 48V (51.2V) 100Ah 3U Server Rack LiFePO4 Battery
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • Fast, Free Shipping
    Fast, Free Shipping
  • 30-Day Money-Back Guarantee
    30-Day Money-Back Guarantee
  • Hassle-Free Warranty
    Hassle-Free Warranty
  • Lifetime Customer Support
    Lifetime Customer Support
Payment Method
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms

V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms

$899.99$1,599.99
V2.5 upgraded structure & packaging only. Same performance as V2. 100% safe to parallel.
  • 100X Balance Speed: 3A active balancing vs. 0.03A passive balance, WattCycle has faster multi-channel equalization efficiency, reduces energy loss, and maximizes battery life.
  • 100A BMS Protection: provides 20+ protections & 200A (2s) peak current, low-temp cutoff & overheat protection.
  • More Ways to Monitor: supports a glove-friendly high-brightness LCD touchscreen, fast APP connection, and CAN/RS232/RS485 communication protocols.
  • Stackable 3U Rack-Mount: fits 3U cabinets, plug-and-play easy installation & space saving.
  • Easy to Expand: Max. 20P to release 102.4kWh and support master/slave auto-recognition function.
  • 80% lighter & 75% smaller: 1 unit equals 8x 12V100Ah lead-acid batteries.
  • Durability Outperforms Peers: high-quality metal casing with vibration-resistant, wear-resistant, and excellent heat dissipation.
  • Save More: $300/year savings with solar storage or off-peak charging with peak discharge.
  • Best Service: 5+2 years unique warranty, shipping insurance, and 24/7 professional technical support.
  • Certified: SDS / UN38.3 / IEC / CE / FCC.
View More
🛒 Selling Fast — Superior Quality🎖️

We offer free shipping within the continental U.S. via UPS Ground or FedEx, with orders typically processed in 1–2 business days and delivered within 2–5 business days. Large products such as 12V 628Ah, 48V 314Ah batteries, or 12kW inverters are shipped by truck (LTL) and require signature upon delivery. After order confirmation, we will contact you by email to confirm shipment, and transportation arrangements typically take about 48 hours. Please note that we do not ship to Alaska, Hawaii, Puerto Rico, or PO Box addresses. Delivery times may vary due to external factors such as carrier delays or weather conditions.

For complete details, please visit:
Shipping Policy.

Our batteries come with a 5-year warranty, which can be extended to 7 years total upon product registration. Accessories are covered by a 1-year warranty, and like-new (refurbished) batteries include a 1-year warranty.

For full terms, conditions, and claim details, please visit:

Warranty Policy

  • Fast, Free Shipping
    Fast, Free Shipping
  • 30-Day Money-Back Guarantee
    30-Day Money-Back Guarantee
  • Hassle-Free Warranty
    Hassle-Free Warranty
  • Lifetime Customer Support
    Lifetime Customer Support
Payment Method
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
  • V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
48V (51.2V) 100Ah 3U Server Rack LiFePO4 Battery
V2.5 WattCycle 48V 100Ah Server Rack Bluetooth LiFePO₄ Battery – Active Balancing | LCD | Smart Comms
$899.99
$1,599.99

How the WattCycle Energy System Works?

Home Backup Power System Specifications

Compare WattCycle 48V home backup kits by inverter output, battery storage, solar input, charging capability and system scalability.

5.12kWh Essential Home Backup Kit

One 51.2V 100Ah rack battery paired with a 6kW 120/240V split-phase solar charger inverter.

6kW + 5.12kWh
Specification
6kW Inverter
51.2V 100Ah Rack Battery
1. Core Performance & Capacity
Rated Power / Energy
6kW Inverter 6kW 120/240V Split-Phase Solar Inverter 4,800W Single Phase
Battery 5.12kWh / 100Ah
Peak / Battery Count
6kW Inverter 9,000VA Peak
Battery 1 × 51.2V 100Ah
Voltage
6kW Inverter 120Vac / 240Vac Pure Sine Wave
Battery 51.2V Rated 57.2V ±1.2V Recommended Charge
Efficiency / Cycle Life
6kW Inverter >93% Max. Inverter Efficiency
Battery 6,000 Cycles @ 80% DOD
Current Capability
6kW Inverter 51.2V Rated Battery Input 44V Minimum Start Voltage
Battery 100A Max. Continuous Discharge 50A Standard / 100A Max. Charge
2. Solar & Charging
Maximum PV Input
6kW Inverter 9,000W
Battery —
MPPT
6kW Inverter 1 MPPT 90Vdc–450Vdc MPPT Range
Battery —
PV Voltage / Current
6kW Inverter 500Vdc Max. PV Voc 27A Max. PV Input Current
Battery —
Hybrid Charging
6kW Inverter Up to 120A AC + PV Combined
Battery 100A Max. Charge Current
3. System Management & Expansion
Transfer Time
6kW Inverter 10ms Typical
Battery —
Parallel Capability
6kW Inverter Inverter Parallel: Not Supported
Battery Up to 20 Batteries in Parallel
Communication
6kW Inverter USB / RS485 / WiFi-GPRS / Dry Contact
Battery CAN / RS485 / RS232
4. Physical & Certification
Dimensions
6kW Inverter 19.02 × 13.35 × 5.00 in 483 × 339 × 127 mm
Battery 19.09 × 17.72 × 5.24 in 485 × 450 × 133 mm
Weight
6kW Inverter 25.35 lbs
Battery 91.9 lbs
Certification
6kW Inverter FCC Part 15, Class B
Battery IEC / CE / FCC / UN38.3 Cells: UL1642 / UL2580 / UN38.3
System sizing note: The included rack battery is rated for 100A maximum continuous discharge. When operating from battery power alone, available continuous system output is also limited by the battery bank, wiring and protection devices. Additional parallel batteries can increase available battery-side current and storage capacity.
20.48kWh High-Capacity Home Backup Kit

Four 51.2V 100Ah rack batteries paired with a 12kW 120/240V split-phase inverter featuring dual MPPT solar input.

12kW + 20.48kWh
Specification
12kW Inverter
4 × 51.2V 100Ah Rack Batteries
1. Core Performance & Capacity
Rated Power / Energy
12kW Inverter 12,000W Split Phase 7,200W Single Phase
Battery System 20.48kWh / 400Ah
Peak / Battery Count
12kW Inverter 18,000VA Peak
Battery System 4 × 51.2V 100Ah
Voltage
12kW Inverter 120Vac / 240Vac Pure Sine Wave
Battery System 51.2V Rated
Efficiency / Cycle Life
12kW Inverter >91% Max. Inverter Efficiency
Battery System 6,000 Cycles per Battery @ 80% DOD
Battery Current Capability
12kW Inverter 51.2V Rated Battery Input 44V Minimum Start Voltage
Battery System 4 × 100A Max. Continuous Discharge 100A Maximum per Battery
2. Solar & Charging
Maximum PV Input
12kW Inverter 24,000W 12,000W + 12,000W
Battery System —
MPPT
12kW Inverter 2 Independent MPPTs 90Vdc–450Vdc MPPT Range
Battery System —
PV Voltage / Current
12kW Inverter 500Vdc Max. PV Voc 32A + 32A Max. PV Input
Battery System —
Hybrid Charging
12kW Inverter Up to 250A AC + PV Combined
Battery System 50A Standard / 100A Max. per Battery
3. System Management & Expansion
Transfer Time
12kW Inverter 10ms Typical
Battery System —
Parallel Capability
12kW Inverter 1–6 Inverters Up to 72kW Rated Output
Battery System Up to 20 Batteries in Parallel Current Kit Includes 4
Communication
12kW Inverter USB / RS485 / WiFi-GPRS / Dry Contact
Battery System CAN / RS485 / RS232
4. Physical & Certification
Dimensions
12kW Inverter 24.41 × 17.72 × 5.20 in 620 × 450 × 132 mm
Each Rack Battery 19.09 × 17.72 × 5.24 in 485 × 450 × 133 mm each
Weight
12kW Inverter 52.47 lbs
Battery System 4 × 91.9 lbs
Certification
12kW Inverter UL1741 / CSA C22.2#107.1 FCC Part 15, Class B
Battery System IEC / CE / FCC / UN38.3 Cells: UL1642 / UL2580 / UN38.3
Certification note: UL1741 / CSA C22.2#107.1 certification is listed in the inverter manual. Installation, interconnection and permitting requirements must still follow applicable local codes, AHJ requirements and utility rules.

In his hands-on test, “There’s A Trick For That” described the WattCycle 48V server rack battery as an “incredible bang-for-your-buck” way to massively expand a portable power station—demonstrating how two packs can deliver ~10× the capacity compared with many brand-name OEM expansion batteries, while staying surprisingly compact. He was especially impressed by the large, bright premium screen, app control, and “super legit” advanced BMS settings (with a clear note to keep defaults if you’re not experienced), plus the premium internal build—clean cable management, robust bus bars, multiple temperature sensors, and solid cell compression—saying WattCycle “knocked it out of the park” for the price.

Works with popular portable power stations (EcoFlow / BLUETTI) via common 48V LiFePO4 expansion methods*. Watch his full demo + teardown in the video below.

*Compatibility depends on the specific model and wiring method. Please follow professional guidance and local electrical safety requirements.

Video Cover Play

This user recently purchased and used WattCycle batteries at his own expense, and in the new version (2.5), several improvements are clearly visible: upgraded packaging (thicker boxes, foam, and wooden protection), recessed terminals for better safety, a lighted power switch, more durable terminal covers, and longer communication cables. Internally, the battery still uses 102Ah BYD cells, with minor changes such as a repositioned temperature sensor and engraved QR codes on the cells.

The key point, however, is that WattCycle carefully listened to user feedback and quickly implemented product improvements.

Video Cover Play

The reviewer’s takeaway was simple: this rack battery looks premium, feels well-built, and performs like it should. They specifically praised the phone-like responsive touchscreen (clear live SOC/voltage/current/temps plus cell-level data and alarms), confirmed capacity right around the rated 100Ah, saw stable output under real inverter loads, and liked how fast the BMS protection shut things down during overcurrent/overheat tests. The teardown also backed it up with solid internals—laser-welded connections, heavy busbars, lots of temp sensing, and proper heat sinking/airflow.

Video Cover Play

High-current active balancing function

WattCycle's active balancing function effectively protects battery cells, improves safety, extends battery pack life, and increases capacity utilization. Ultra-high 3A balancing current: Faster balancing speed, better balancing effect, and better adaptation to large-capacity battery cells.

Second-troubleshooting capability, flexibly handling all situations

Power button and short-circuit valve – one switch handles all emergencies, giving your battery a dual boost of emergency and flexibility! Powerful BMS chip automatically cuts off faults in seconds, promptly responding to short circuits, overloads, and other situations, suitable for safe use in high-power devices.

Customizable system power, compatible with all inverters

WattCycle 48V 100Ah 3U rack lithium battery can be easily expanded to 20 batteries (automatic addressing). Seamless insertion into the 3U rack makes it simple and convenient. Its CAN/RS485/RS232 is compatible with various inverter brands on the market, easily adapting to multiple scenarios, with strong anti-electromagnetic interference capabilities and millisecond-level command interaction.

Modular stacking for seamless capacity expansion

The WattCycle 3U Rack battery is suitable for small spaces with simple plug-and-play functionality. Expansion is as easy as building with blocks, ensuring every inch of space is utilized! Whether for emergency power needs or everyday electricity usage, it provides a continuous and stable power supply, eliminating energy worries.

Superior craftsmanship is reflected in the details

WattCycle LiFePO4 batteries use the highest quality core components, featuring a neat internal structure and a metal bracket for enhanced internal stability. Externally, they offer four interface terminals and a detachable handle for easy use, transport, and installation.

Tech Specs

Specifications

Dimensions 19.09 x17.72 x5.24 inch
Weight 91.9lbs
Capacity 100Ah
Energy Storage 5120Wh
Nominal Voltage 51.2V
Self Discharge Rate <3%/Month
Series & Parallel Connections 1 Series(Max), 20 Parallel(Max)

Charging

Max. Charge Voltage 58.4V
Max. Charge Current 100A
Recommend Current 20A
Charging Temperature Protection 23~41°F; 122~140°F
Discharging Temperature Protection -13~5°F; 131~149°F
Short Circuit Current Protection support

Discharging 

Cont. Dischagre Current 100A
Over-Current Discharge Protection 120A±10A/10S

Others

Case Material Steel Plate Cold Common (SPCC)
Certifications IEC/CE/FCC/UN38.3