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-6420

Altronix AL602ULADAJ Compatible Alarm Replacement Battery Set

Sale price $116.86 USD Regular price $141.09
Shipping calculated at checkout.

➤ Compact 12V power supply for versatile use

➤ 12 Ah capacity ensures long-lasting energy

➤ Reliable F2 terminal type for secure connections

➤ Durable design built for consistent performance

➤ Ideal for backup power and small electronics


📦🚀 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

12 Volts | 12 Ah

Terminal Type

F2

SigmasTek 12 Volts 12 Ah F2 Replacement Battery — Compatible Model: 12 Volts 12 Ah F2

This SigmasTek 12 Volts 12 Ah F2 replacement battery delivers dependable compatibility, consistent performance, and proven reliability for a wide range of security and backup systems. Designed for straightforward replacement in units that accept an F2 terminal configuration, this high-performance battery provides the power density and stability you expect from a quality sealed lead-acid pack. Whether you are maintaining alarm panels, small UPS modules, or emergency power components, this long-lasting battery offers the dependable runtime and recharge acceptance needed to keep systems online when they matter most.

Key Specifications

  • Voltage: 12 Volts
  • Amp Hours: 12 Ah
  • Terminal Type: F2
  • Brand / Manufacturer: SigmasTek

Benefits

Built to deliver longevity and consistent performance, this replacement battery is optimized for deep cycling and standby applications where reliability is essential. The sealed design minimizes maintenance while resisting vibration and environmental stress — making it an ideal high-performance battery for security systems and other critical equipment. The 12 Ah capacity balances runtime and compact form factor, allowing for straightforward installation in cabinets and enclosures that accept F2 terminals.

Expect durable construction, predictable recharge behavior, and low self-discharge for seasonal readiness. This long-lasting battery is well-suited for UPS systems and emergency power backups that require quick, reliable activation during outages. It’s also an excellent option for security alarm panels, access control devices, and small-scale power tools or instrumentation that rely on sealed lead-acid technology for steady output.

With clear compatibility to systems using the 12 Volts 12 Ah F2 configuration, technicians and facility managers can replace aging packs without complex retrofits — saving time and reducing downtime. The SigmasTek brand is known for competitive performance in replacement batteries that balance cost and service life for residential and commercial installations.

Ready to upgrade your power backup? Add this SigmasTek 12 Volts 12 Ah F2 replacement battery to your cart now to ensure uninterrupted protection and reliable performance when it counts.


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.