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SigmasTek  |  SKU: BW-4221

APC BACK-UPS PRO BP420 UPS High Performance Replacement Battery

Sale price $16.99 USD Regular price $24.15
Shipping calculated at checkout.

➤ Meets or exceeds OEM SLA battery specifications

➤ Absorbent Glass Mat (AGM) technology for reliable performance

➤ Maintenance-free with spill-proof construction

➤ U.L. recognized and CE certified for safety assurance

➤ Includes 1 year warranty for peace of mind


📦🚀 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.

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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

12 Volts | 7.5 Ah

Terminal Type

F2

Replacement APC BACK-UPS PRO BP420 Battery — Compatible with APC BACK-UPS PRO BP420

Keep your APC BACK-UPS PRO BP420 running at peak reliability with this replacement UPS battery engineered for compatibility, dependable performance, and peace of mind. This high-quality replacement UPS battery meets or exceeds OEM SLA specifications to deliver consistent power delivery during outages and protect sensitive equipment. Designed for reliable standby operation and fast recovery, this long-lasting battery is an ideal choice when you need a high-performance UPS battery that restores full runtime quickly and safely.

Key Specifications

  • Compatible Model: APC BACK-UPS PRO BP420
  • Brand: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 7.5 Ah
  • Terminal Type: F2
  • Battery Type: SLA (Sealed Lead Acid)
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Design: High Rate Discharge Design
  • Maintenance: Maintenance-Free Design with Spill Proof Construction
  • Safety & Certification: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Typical Applications: Emergency Power Supply; Battery Powered Tools

Benefits

Engineered for durability and dependable service life, this replacement battery offers a robust combination of performance and safety. The Absorbent Glass Mat (AGM) technology provides vibration resistance and superior charge acceptance for a long-lasting battery experience, while the maintenance-free, spill-proof construction reduces upkeep and simplifies installation. As a high-performance UPS battery, it supports high rate discharge demands commonly seen during power failover, ensuring your APC BACK-UPS PRO BP420 delivers stable power to networking devices, servers, and workstations when it matters most.

The certification credentials—U.L. recognized and CE certified—underscore the product’s compliance with safety and quality standards. Backed by a 1 Year Warranty and shipped brand new and factory fresh, this replacement UPS battery is a cost-effective alternative to OEM parts without sacrificing reliability. Typical applications include UPS systems, emergency power supplies, and battery-powered tools where dependable discharge and recharge cycles are critical.

Whether you’re replacing an aging battery or stocking spares for maintenance, choosing this SigmasTek 12V 7.5Ah F2 battery ensures your APC BACK-UPS PRO BP420 continues to perform as intended. It’s a practical, long-lasting solution designed to minimize downtime and maximize protection for your electronic equipment.

Ready to restore runtime and reliability? Add this high-performance UPS battery compatible with APC BACK-UPS PRO BP420 to your cart now and enjoy secure, long-lasting power protection backed by a 1 Year Warranty.


Payment & Security

Payment methods

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