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-12865

Sonnenschein A512/25G5 High Performance Replacement Battery

Sale price $119.98 USD Regular price $139.48
Shipping calculated at checkout.

➤ Meets or exceeds OEM Sonnenschein A512/25G5 SLA battery specifications

➤ Absorbent Glass Mat (AGM) technology for reliable, maintenance-free operation

➤ Spill-proof construction ensures safe use in various applications

➤ U.L. Recognized and CE Certified for guaranteed quality and safety

➤ Includes 1-year warranty and is brand new, factory fresh 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.

📸 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 | 26 Ah

Terminal Type

Nut & Bolt

Sonnenschein A512/25G5 Replacement Battery — Compatible with Sonnenschein A512/25G5

This Sonnenschein A512/25G5 replacement battery is engineered for guaranteed compatibility, dependable performance, and long-term reliability with your Sonnenschein A512/25G5 emergency lighting systems. Built using Absorbent Glass Mat (AGM) technology and a maintenance-free design, this high-performance battery delivers consistent power when you need it most. Whether you are servicing emergency lighting, security equipment, or sensitive electronics, this replacement battery provides the dependable energy reserve required for critical applications.

Key Specifications

  • Model Compatibility: Sonnenschein A512/25G5
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Design: Maintenance-Free Design
  • Construction: Spill Proof Construction
  • Safety 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

Choose a trusted replacement battery that combines durability and safety. The Sonnenschein A512/25G5 replacement is built with AGM technology for enhanced vibration resistance and reduced internal resistance, translating to reliable startup and steady output under load. Its spill proof construction and maintenance-free design make it ideal for enclosed or vertical installations without the risk of leakage or the need for regular topping-up.

This long-lasting battery is a high-performance battery designed for repeated charge and discharge cycles in demanding environments. The UL recognition and CE certification ensure compliance with safety and quality standards, giving you peace of mind when used in commercial and residential settings. With SigmasTek manufacturing and a brand new, factory-fresh build, you get consistent quality and traceable production standards.

Typical applications include emergency lighting and fire alarms where reliable backup power is mandatory, but this long-lasting battery is equally well-suited for security alarms, medical equipment, and consumer electronics. It is also a solid choice for UPS systems and emergency power setups that require a dependable reserve, and for portable tools or systems that demand a high-performance battery with secure nut & bolt terminals for robust connections.

Ready to replace your Sonnenschein A512/25G5? Order this high-performance replacement battery now to restore dependable backup power and peace of mind. Click to purchase and secure fast shipping and a 1 year warranty today.


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.