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SigmasTek  |  SKU: BW-5052

ONEAC ON2000AU-SN UPS High Performance Compatible Replacement Battery Set 50.64 lb

15% off
New arrival
$216.99 USD $253.99
Shipping calculated at checkout.
Set of 4 new SigmasTek SP12-18HR batteries (12V 18AH) for ONEAC ON2000AU-SN
High rate discharge design for reliable short-term power bursts
Valve regulated, spill-proof technology for safe maintenance-free use
Low self-discharge extends battery life during storage
Certified safety with 1-year warranty and OEM specification compliance
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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 ON2000AU-SN UPS

Keep your ONEAC ON2000AU-SN running at peak performance with this replacement UPS battery set featuring SigmasTek SP12-18HR batteries. Built for compatibility and engineered for consistent output, this high-performance UPS battery pack offers reliable backup power and fast discharge capability for demanding loads. Remember to reuse your existing cables and hardware when installing this battery set.

Key Specifications

  • Brand: SigmasTek
  • Model: SP12-18HR
  • Voltage: 12 Volts
  • Capacity: 18 AH (Amp-hours)
  • Quantity: 4 batteries (battery set)
  • 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 set provides a durable, long-lasting battery option for the ONEAC ON2000AU-SN. The high-rate discharge capability is ideal for UPS applications that demand elevated power output over short intervals, ensuring your critical systems remain protected during transitions to generator or power restoration. As a high-performance UPS battery, the SigmasTek SP12-18HR is engineered for consistent performance, low maintenance, and extended shelf life due to its low self-discharge properties.

Safety and longevity are addressed through the valve regulated, spill-proof construction and high vibration resistance—features that make these batteries suitable for rack-mounted UPS systems, transportation, and field installations. Certified by U.L. and CE, they meet recognized safety and performance standards, and each battery is factory fresh and tested to meet or exceed OEM expectations. Typical applications include uninterruptible power supply units, emergency power supply systems, and battery-powered tools requiring dependable burst power.

Our knowledgeable support team is available at or via email if you need assistance choosing or installing replacement batteries for the ONEAC ON2000AU-SN. In-stock orders usually ship within 24 hours, getting you back to full protection quickly.

Don’t wait for a failure — purchase this long-lasting battery replacement set for your ONEAC ON2000AU-SN today and ensure uninterrupted protection for your critical equipment.

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 ON2000AU-SN
  • Manufacturer: SigmasTek
  • Product Type: UPS Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

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