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-5787

12V 3.5AH High Performance Alarm Replacement Battery

Sale price $21.59 USD Regular price $26.06
Shipping calculated at checkout.

➤ High performance 12V 3.5AH capacity for reliable power

➤ Maintenance-free and spill-proof AGM technology for safety

➤ Wide operating temperature range ensures durability in various conditions

➤ Guaranteed compatibility with original battery using F1 terminal

➤ 1-year warranty for peace of mind and quality assurance


📦🚀 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 | 3.5 Ah

Terminal Type

F1

12V 3.5AH Alarm Battery — Compatible with SigmasTek Alarm Systems (F1 Terminal)

Keep your alarm and small standby devices powered with this compact 12V 3.5AH Alarm Battery, a reliable replacement battery engineered for consistent performance and long service life. This maintenance-free, spill-proof SLA with AGM technology is a high-performance battery designed to meet or exceed original manufacturer specifications. It is ideal for smaller alarm panels and devices requiring dependable backup power without frequent maintenance.

Key Specifications

  • Brand: SigmasTek
  • Model: 12V 3.5AH Alarm Battery (F1)
  • Voltage: 12 Volts
  • Capacity: 3.5 Ah
  • Terminal Type: F1
  • Chemistry: SLA (Sealed Lead Acid)
  • Technology: AGM (Absorbent Glass Mat)
  • Weight: 2.9 Lbs
  • Length: 5.24 inches
  • Width: 2.64 inches
  • Height: 2.36 inches
  • Maintenance: Maintenance-free
  • Safety: Spill proof
  • Shipping Methods: UPS Ground and USPS
  • Shipping Time: Ships in 1 business day for in-stock items
  • Warranty: 1-year Warranty
  • Compatibility: Guaranteed compatibility with original battery

Benefits

  • Durability: Constructed with sealed AGM cells to resist vibration and prevent leakage, providing a dependable, maintenance-free power source.
  • Long Life: Engineered for a long expected service life and reliable performance across a wide temperature range.
  • High Performance: Although compact, this battery delivers stable discharge characteristics for reliable alarms and small backup systems, making it a trusted high-performance battery.
  • Easy Replacement: Install as a like-for-like replacement using the original configuration and existing cables; confirm dimensions before ordering to ensure compatibility.
  • Typical Uses: Ideal for small alarm panels, security sensors, compact UPS units, emergency lighting heads, and portable equipment.
  • Support & Warranty: Backed by a 1-year warranty and responsive customer service by phone, chat, or email to assist with selection and installation.
  • Bulk Options: Save on multiple purchases through BatterySharks.com quantity discounts — submit an RFQ for tailored pricing.

For a compact, reliable replacement battery that keeps alarm systems and small backup devices functioning when it matters most, choose the 12V 3.5AH Alarm Battery from SigmasTek. Order today to secure fast shipping, dependable performance, and outstanding customer 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.