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SigmasTek  |  SKU: BW-5336

Eaton Powerware BAT-0408 UPS High Performance Replacement Battery 12.66 lb

10% off
New arrival
$55.99 USD $61.99
Shipping calculated at checkout.
High Rate Discharge Design for optimized UPS performance
Valve Regulated Spill Proof Construction for leak prevention
Low Self-discharge for extended standby time
High Vibration Resistance enhances durability
Certified and backed by a 1 Year Warranty
In stock

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from 22 reviews

WORKS GREAT!

Anonymous

Fast shipping and fair pricing. I will look to you for future battery purchases.

Anonymous

It's hard to rate a battery until some time has passed and it either continues functioning as it should of "gives up the ghost." It was not a straight bolt in application. The positive terminal was different than the stock battery and the positive lead from the motorcycle had to be bent in order to attach it to the battery. Otherwise, if the battery gives long service I have no complaints.

Anonymous

Shopping with you is a bit difficult; I had to type in a few words differently before I could find the battery's I was looking for.

Laura J

Excellent Product, timely delivery, love the extra battery life. Would recommend. rk

Robin Keister

Very easy to buy, high confidence that it was legit company. Reviews were good. Price, in the ball park. We'll see when I get battery.

Rob

Thank you for supplying the battery that I wanted. It arrived today in good order. Its specifications are as advertised and after charging, performs as expected.
Thank you for your professional approach to the payment method.
Regards Roy VK4ZQ.

Roy O'Malley

It worked

Mel Light

Finally found a battery that is similar in function to original equipment.

Anonymous

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In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
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Michael Talianker

this battery was just what I needed.

Robert Jones

Product is exactly as described and arrived quickly

Robert Jones

Great deal for the money.

Linda M.

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.

Easy to purchase

Alberto J.

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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Category

UPS Batteries

Brand Replacement

SigmasTek

Volts & Amps

12 Volts | 18 Ah

Terminal Type

Nut & Bolt

SigmasTek SP12-18HR Replacement UPS Battery for Eaton Powerware BAT-0408

This SigmasTek SP12-18HR is a precision replacement UPS battery engineered to restore reliable backup power to your Eaton Powerware BAT-0408 UPS. Designed for compatibility and performance, this 12 Volts 18 AH unit delivers the high-rate discharge capability required by demanding UPS systems. If you need a dependable, long-lasting battery that preserves uptime and protects sensitive equipment, this high-performance UPS battery is an excellent choice for both residential and commercial applications.

Key Specifications

  • Brand: SigmasTek
  • Model: SP12-18HR
  • Compatible with: Eaton Powerware BAT-0408
  • Voltage: 12 Volts
  • Capacity: 18 AH (amp-hours)
  • Terminal Type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof
  • Features: Low Self-discharge, High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year

Benefits

This replacement UPS battery offers robust durability and consistent performance. The valve-regulated spill proof construction and high vibration resistance make it suitable for environments where steady operation under stress matters. Because it is engineered for high-rate discharge, the battery can deliver higher power output over short intervals — perfect for UPS systems that must support critical loads during outages. Low self-discharge ensures the battery retains charge when stored, helping maintain readiness until installation.

As a long-lasting battery solution, the SigmasTek unit is thoroughly tested to meet or exceed OEM specifications, giving you confidence in uptime and system protection. Typical applications include Uninterruptible Power Supply (UPS) units, emergency power supply systems, and battery-powered tools. Whether you’re replacing a single module in a rack-mounted UPS or stocking spare batteries for emergency maintenance, this high-performance UPS battery delivers the reliability you need.

Please note: you should reuse all existing cables and hardware from your original configuration to connect this replacement UPS battery to your Eaton Powerware BAT-0408. Our technical team tests every battery to ensure compatibility and dependable performance.

Ready to restore protected power? Order this SigmasTek SP12-18HR replacement UPS battery for your Eaton Powerware BAT-0408 today. Enjoy a superior long-lasting battery with a 1 year warranty and fast shipping on in-stock items—often shipped within 24 hours.

Technical Specifications

Voltage12 Volts
Amp Hours18 Ah
Terminal TypeNut & Bolt
Length (in.)7.13
Width (in.)3.0
Height (in.)6.59
Weight (lb.)12.65

Product Highlights

  • Brand Replacement : Eaton Powerware
  • Manufacturer: SigmasTek
  • Product Type: UPS Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

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