For questions, quotes, or help finding the right battery, feel free to email us at sales@batteryweb.com

New collections added! Learn more

🎉 First Order Special 🎉

First-time shoppers get 5% OFF on batteries & accessories!

WELCOME5
SigmasTek  |  SKU: BW-5187

APC BK1250 Compatible Replacement Battery

Sale price $77.60 USD Regular price $112.53
Shipping calculated at checkout.

➤ 24V 18AH battery replacement for APC BK1250 UPS units

➤ High quality, high rate discharge for reliable UPS operation

➤ Tested and guaranteed to meet OEM standards with warranty

➤ In-stock availability and professional support team


📦🚀 FAST SHIPPING: Usually ships same day if ordered before 2 PM EST

⚠️ Quick Reminder

🔹 Please ensure the original battery model number is listed in our product description and that your device model number matches for compatibility.
🔹 We only supply the batteries shown in the images. Device images are provided for reference only.

📸 Send Your Battery Photo / Unsure? Expert 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 IMAGE

Battery Care Guide

Battery Usage and Maintenance Guidelines 🔋

Please read the following instructions carefully before using your new battery. Proper adherence will help ensure optimal performance and extended service life.

1. Cordless Phones, PDAs, and Power Tools (NiMH, NiCd, Lithium-Ion) 📱

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Operate the device until the battery reaches approximately 20% capacity.
  • Avoid premature recharging.
  • Do not allow the battery to fully discharge during the initial cycles.

Post-Conditioning

  • Recharge the battery only when necessary.
  • These batteries are capable of approximately 500 charge cycles:
  • Once daily → ~500 days
    Twice daily → ~250 days
    Note: Even a partial recharge is considered a full cycle.

2. Sealed Lead Acid (SLA) Batteries 💡

  • No conditioning required.
  • Maintain the battery in a fully charged state; avoid complete discharge.
  • Capable of 300–400 charge cycles.
  • Expected service life: 2–3 years, depending on usage conditions.

3. Laptop Batteries (Lithium-Ion) 💻

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Charge fully, then discharge to approximately 20% capacity.
  • Avoid complete discharge, as some devices may not detect a fully drained battery.

Post-Conditioning

  • Minimize frequent plugging and unplugging.
  • Allow the battery to discharge moderately at least once per month to maintain optimal performance.
  • Occasional cycling is recommended to sustain battery health.

Professional Recommendation

Adhering to these guidelines will enhance battery longevity and ensure reliable performance.

For further assistance regarding your battery or order, our customer support team is available to provide guidance.

Delivery and Shipping

Everything You Need to Know About Shipping with BatteryWeb (USA)

We know reliable delivery matters when you need power fast. Here’s how BatteryWeb makes shipping easy across the USA:

🚚 Shipping & Delivery

Most orders ship next business day (some products like sealed lead acid may take a little longer).

Same-day shipping available if you order before 11:59 AM (delivery depends on the carrier).

We ship nationwide using FedEx, UPS, USPS, DHL, and regional ground carriers.

Shipping costs are calculated automatically at checkout based on weight, distance, and carrier.

Transit times shown are estimates only (business days, no weekends/holidays).

🌍 Shipping Restrictions

Lithium batteries cannot be shipped by USPS or air. They must go via FedEx Ground, UPS Ground, or DHL Ground.

PO Box deliveries are only available via USPS.

At this time, we do not ship lithium batteries to Puerto Rico. NiMH, NiCd, and Alkaline can be shipped.

📦 Important Notes

Double-check your shipping address! If an incorrect address is used and the order is returned, re-shipping costs are the buyer’s responsibility.

If a product is temporarily out of stock, we’ll notify you right away with the expected restock date—or issue a refund if you prefer.

💲 Currency & Pricing

All prices are shown in USD.

Orders shipped outside the USA may be subject to local taxes, customs fees, or import duties. These are the buyer’s responsibility.

⚡ At BatteryWeb, we’re committed to getting your batteries delivered quickly, safely, and affordably—so you’ll always have the power you need, when you need it.

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.

🔹 Our products are generic replacement parts and are not affiliated with, endorsed by, or manufactured by the original equipment manufacturers (OEMs).


Volts & Amps

24 Volts | 18 Ah

Terminal Type

Special Connector

SigmasTek Replacement Battery for APC BK1250 (24 Volts 18 AH)

Restore reliable backup power to your APC BK1250 with this brand new replacement UPS battery that balances compatibility, performance, and dependable service life. Specifically designed for high-rate discharge UPS applications, this high-performance UPS battery supplies the energy needed for short, high-power demands while ensuring consistent operation for your critical systems. With same-day shipping available and professional support, this replacement is an ideal choice for anyone seeking a cost-effective, long-lasting battery solution.

Key Specifications

  • Brand: SigmasTek
  • Compatible UPS Model: APC BK1250
  • Quantity Included: 1 battery
  • Voltage: 24 Volts
  • Capacity: 18 AH
  • Connector: Special Connector
  • Design: High Rate Discharge Design
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Shipping: In Stock and Same Day Shipping
  • Support: Professional Customer Support
  • Performance: Performance Guaranteed
  • Installation Note: You must use the existing cables and hardware to connect your UPS batteries

Benefits

  • Dependable long-lasting battery performance: Engineered to provide steady capacity and extended service life, this replacement UPS battery helps maintain uninterrupted protection for your APC BK1250.
  • Superior high-performance UPS battery design: The high rate discharge capability ensures strong power output for brief, demanding events — perfect for UPS systems that need rapid response.
  • Robust construction and testing: Every battery is factory fresh and tested by knowledgeable technicians to meet or exceed OEM standards, offering durability and consistent performance under load.
  • Versatile application: Ideal for UPS systems, emergency power setups, and equipment backups for tools and electronics where reliable reserve power is needed.
  • Simple installation and support: Replace the battery quickly using your existing cables and hardware, and rely on professional customer support if questions arise during installation or selection.
  • Fast fulfillment and warranty protection: With in-stock availability, same day shipping, and a 1 year warranty, you get both speed and assurance when you purchase this replacement for the APC BK1250.

Don’t wait until a failure disrupts your operations — buy this SigmasTek 24 Volts 18 AH replacement UPS battery for the APC BK1250 now and enjoy reliable, high-performance backup power with fast shipping and quality support.


Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • 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.