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SigmasTek  |  SKU: BW-13923

Universal Power UB645 (D5733) High Capacity Compatible Replacement Battery 1.59 lb

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Sale price $21.99 USD Regular price $24.99
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Compatible replacement for Universal Power UB645 (D5733) model
Uses advanced Absorbent Glass Mat (AGM) technology for reliable performance
Maintenance-free and spill-proof design for easy and safe usage
U.L. Recognized and CE Certified for quality assurance
Includes 1 year warranty and guaranteed factory fresh condition
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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.


Volts & Amps

6 Volts | 4.5 AH

Terminal Type

F1

Universal Power UB645 (D5733) Replacement Battery

This replacement battery for the Universal Power UB645 (D5733) delivers reliable compatibility, consistent performance, and dependable reliability for your equipment. Designed to meet or exceed OEM specifications, the Universal Power UB645 (D5733) high-performance battery uses AGM technology for safe, maintenance-free operation. If you need a long-lasting battery that fits right into your device and provides steady power for critical applications, this option from SigmasTek is engineered to deliver the runtime and safety features you expect.

Key Specifications

  • Compatible Model: Universal Power UB645 (D5733)
  • Brand: SigmasTek
  • Battery Type: Rechargeable Sealed Lead Acid (SLA)
  • Technology: Absorbent Glass Mat (AGM)
  • Voltage: 6 Volts
  • Capacity: 4.5 AH
  • Terminal: F1
  • Design: Maintenance-Free with Spill Proof Construction
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty

Benefits

This replacement battery is built for durability and consistent, long-term operation. The AGM construction provides a robust, vibration-resistant internal structure that supports repeated charge cycles while minimizing leakage and maintenance needs. As a high-performance battery, it delivers reliable voltage under load, making it ideal for applications that demand steady power delivery and dependable runtime.

Expect longer service life compared to conventional flooded lead-acid batteries thanks to the sealed AGM design and quality manufacturing standards. The maintenance-free, spill-proof construction simplifies installation and reduces the need for routine electrolyte checks, which is especially valuable in enclosed or sensitive equipment environments.

Typical applications for this long-lasting battery include UPS systems, emergency lighting and backup power, alarm systems, medical devices, and portable tools or instruments that require 6V, 4.5AH power modules. Because it is U.L. recognized and CE certified, it meets safety and quality benchmarks that make it suitable for both home and professional installations.

When you need a trustworthy replacement battery for your Universal Power UB645 (D5733), this SigmasTek unit combines performance, safety, and peace of mind with a one-year warranty to back it up.

Ready to upgrade to a reliable, long-lasting battery? Add this Universal Power UB645 (D5733) replacement battery to your cart today and ensure uninterrupted power for your equipment.

Technical Specifications

Voltage6 Volts
Amp Hours4.5 AH
Terminal TypeF1
Length (in.)2.76
Width (in.)1.86
Height (in.)3.94
Weight (lb.)1.59

Product Highlights

  • Brand Replacement : Universal Power UB645
  • Manufacturer: SigmasTek
  • Product Type: SLA Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

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