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SigmasTek  |  SKU: BW-5054

ONEAC ON2000 UPS High Performance Compatible Replacement Battery Set 50.64 lb

19% off
New arrival
$216.99 USD $268.99
Shipping calculated at checkout.
Includes 4 brand new SigmasTek SP12-18HR batteries (12V 18 AH)
Designed for high rate discharge to support UPS short bursts of power
Valve regulated and spill-proof for enhanced safety and maintenance-free use
Low self-discharge improves shelf life and performance reliability
Certified by U.L. and CE with a 1-year warranty for peace of mind
In stock

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Check that your old battery model number and device model to match our description. This makes sure they work together.

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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

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In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
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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.

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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🔹 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 Battery Set for ONEAC ON2000 UPS

Ensure continued uptime for your ONEAC ON2000 with this SigmasTek SP12-18HR replacement UPS battery set. Providing reliable compatibility, consistent performance, and factory-fresh reliability, this pack is an excellent choice when you need a replacement UPS battery that restores full backup capability. Remember to use all existing cables and hardware from your original configuration during installation.

Key Specifications

  • Brand: SigmasTek
  • Model: SP12-18HR
  • Voltage: 12 Volts
  • Capacity: 18 AH (Amp-hours)
  • Quantity: 4 batteries (battery set)
  • 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 set is engineered to be a long-lasting battery option for the ONEAC ON2000. The high-rate discharge capability supports short-duration high-load events, ensuring your UPS can supply required power during transitions. As a high-performance UPS battery solution, the SP12-18HR minimizes maintenance with valve regulated, spill-proof construction and reduces storage-related capacity loss thanks to low self-discharge characteristics.

Built for durability with high vibration resistance and backed by U.L. recognition and CE certification, these batteries are ideal for critical backup systems, emergency power supplies, and battery-powered tools. Each battery is brand new and factory tested to meet or exceed OEM performance, delivering confidence in both standby reliability and active duty cycles.

Need assistance selecting the right replacement batteries for the ONEAC ON2000? Our experienced staff is available at or via email to help you choose and install the correct set. In-stock orders typically ship within 24 hours so you can restore protection quickly.

Take action now — buy this high-performance replacement UPS battery set for your ONEAC ON2000 and keep your critical systems protected with a durable, long-lasting battery solution.

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 ON2000
  • Manufacturer: SigmasTek
  • Product Type: UPS Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

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