Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com

WELCOME5
SigmasTek  |  SKU: BW-16142

National Power GT155S5 High Performance Replacement Battery 18.1 lb

24% off
Sale price $111.99 USD Regular price $147.99
Shipping calculated at checkout.
Absorbent Glass Mat (AGM) technology for enhanced performance
Maintenance-free and spill-proof design for hassle-free use
U.L. recognized and CE certified for safety and reliability
Brand new, factory-fresh condition ensures long-lasting power
Compatible with National Power GT155S5 model, backed by 1-year warranty
In stock

— Ready to ship immediately

Free shipping

Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe

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


We ship your order same day if you buy it before 4 PM EST.

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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.

Disclaimer

⚠️ 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.


Volts & Amps

12 Volts | 26 Ah

Terminal Type

Nut & Bolt

National Power GT155S5 Replacement Battery — Compatible with National Power GT155S5

For reliable replacement power for your National Power GT155S5 device, this replacement battery is designed to deliver OEM-level compatibility, safe operation, and consistent runtime. Featuring Absorbent Glass Mat (AGM) technology and a maintenance-free, spill-proof construction, this long-lasting battery is ideal for critical backup systems and daily-use applications alike. It ships brand new and is backed by a 1 Year Warranty for added assurance.

Key Specifications

  • Model Compatibility: National Power GT155S5
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Design: Maintenance-Free Design with Spill Proof Construction
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Brand: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 26 Ah
  • Terminal Type: Nut & Bolt

Benefits

Engineered for durability and dependable performance, this high-performance battery provides stable, efficient power delivery across a range of loads. The AGM design improves charge acceptance, reduces self-discharge, and increases resistance to vibration—characteristics that contribute to a long-lasting battery life in both standby and cyclic environments. The maintenance-free and spill-proof features reduce maintenance time and eliminate the need for regular electrolyte checks.

Applications for the National Power GT155S5 replacement include UPS backup systems, emergency lighting, alarm and security systems, medical equipment backups, mobility solutions, and power tools. The 26 Ah capacity supplies extended runtime for devices requiring steady 12-volt power, while the nut & bolt terminals provide secure, low-resistance connections for robust installations.

Certified by U.L. and CE and supplied brand new from SigmasTek, this replacement battery meets rigorous safety and quality benchmarks. Backed by a 1 Year Warranty, it provides dependable performance and value for users who need a trustworthy power solution.

Need a dependable replacement for your National Power GT155S5? Buy this long-lasting, high-performance battery today and restore reliable power with the assurance of a 1 Year Warranty—order now.

Technical Specifications

Voltage12 Volts
Amp Hours26 Ah
Terminal TypeNut & Bolt
Length (in.)6.56
Width (in.)6.97
Height (in.)4.92
Weight (lb.)18.08

Product Highlights

  • Brand Replacement : National Power GT155S5
  • Manufacturer: SigmasTek
  • Product Type: SLA Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.