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SigmasTek  |  SKU: BW-5045

ONEAC ONXBCU UPS High Performance Replacement Battery Set 50.64 lb

21% off
New arrival
$216.99 USD $275.99
Shipping calculated at checkout.
Includes 4 SigmasTek SP12-18HR batteries (12V, 18 AH)
High rate discharge design for efficient UPS performance
Valve regulated, spill-proof, and vibration resistant
Low self-discharge preserves battery charge over time
Certified quality with U.L. and CE marks plus 1-year warranty
In stock

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Let customers speak for us

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

I'm writing this review to express my deep gratitude and appreciation for the quality of services provided to me by the BatteryWeb service team. I visited BatteryWeb to purchase a replacement battery for my Remington R9 razor. The staff was very responsive and I was really impressed with their willingness to help me and make the purchasing process as quick as possible. In particular I greatly appreciate the work of staff member Shane who was friendly and helpful.
In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
Sincerely,
Michael

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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 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

Engineered for compatibility with the ONEAC ONXBCU UPS, this replacement battery set uses factory-fresh SigmasTek cells to provide dependable runtime, consistent performance, and the durability required for critical backup systems. If your ONEAC ONXBCU needs a reliable, long-lasting battery replacement, this set is a proven solution.

Replacement Battery Set for ONEAC ONXBCU

Key Specifications

  • Included batteries: 4 x SigmasTek SP12-18HR
  • Voltage: 12 Volts
  • Capacity: 18 AH
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction
  • Self-discharge: Low Self-discharge
  • Durability: High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Terminal type: Nut & Bolt
  • Brand: SigmasTek (for ONEAC)

Benefits

  • Valve-regulated, spill-proof design delivers safe, low-maintenance operation in indoor UPS installations and emergency cabinets.
  • High rate discharge design ensures the pack can support sudden load increases and transfer events, making it a reliable high-performance UPS battery option.
  • Low self-discharge enhances shelf and standby life, helping this pack perform as a long-lasting battery solution in backup scenarios.
  • High vibration resistance reduces sensitivity to mechanical stress and extends service life in rack and mobile applications.
  • U.L. and CE certifications demonstrate compliance with safety standards, providing peace of mind for commercial and industrial users.
  • Tested to meet or exceed OEM specifications, these SigmasTek SP12-18HR batteries restore dependable runtime at a competitive price point.
  • Ideal for Uninterruptible Power Supply (UPS) units, emergency power supply systems, and battery-powered tools that need reliable backup power.
  • Important installation note: you must use all existing cables and hardware from your original configuration to connect these batteries; our support team is available to help.

Ready to upgrade your ONEAC ONXBCU with a dependable replacement UPS battery? Add this high-performance, long-lasting battery set to your cart and restore critical power protection today.

Technical Specifications

Voltage12 Volts
Amp Hours18 Ah
Terminal TypeNut & Bolt
Length (in.)7.13
Width (in.)3.0
Height (in.)6.59
Weight (lb.)50.6

Product Highlights

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

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