--- product_id: 107485610 title: "Visonic Powermax Battery For MCS-740 Siren Pack of 2" brand: "visonic" price: "S$81" currency: SGD in_stock: true category: "Visonic" url: https://www.desertcart.sg/products/107485610-visonic-powermax-battery-for-mcs-740-siren-pack-of-2 store_origin: SG region: Singapore --- # 3.5Ah long-lasting capacity 3.6V high-voltage power Plug & play connector included Visonic Powermax Battery For MCS-740 Siren Pack of 2 **Brand:** visonic **Price:** S$81 **Availability:** ✅ In Stock ## Summary > 🔋 Power your peace of mind with lasting energy and effortless swaps! ## Quick Answers - **What is this?** Visonic Powermax Battery For MCS-740 Siren Pack of 2 by visonic - **How much does it cost?** S$81 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/107485610-visonic-powermax-battery-for-mcs-740-siren-pack-of-2) ## Best For - visonic enthusiasts ## Why This Product - Trusted visonic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Extended Runtime:** 3.5Ah capacity ensures your security system stays powered longer, reducing maintenance frequency. - • **Effortless Installation:** Includes fresh cable connectors for a seamless, tool-free battery swap—no technician needed. - • **Trusted by Professionals:** Highly rated with 4.4 stars and praised for reliability and quick delivery—join the savvy buyers. - • **Reliable High-Voltage Power:** 3.6V Lithium Thionyl Chloride cells deliver consistent energy for your MCS-740 siren. - • **Cost-Effective Security Upgrade:** Save hundreds by replacing expensive service calls with this durable, ready-to-use battery pack. ## Overview The Visonic Powermax Battery Pack for MCS-740 Siren features two 3.6V Lithium Thionyl Chloride batteries with 3.5Ah capacity each, designed for long-lasting, reliable siren power. This pack includes cable connectors for easy installation, offering a cost-effective and professional-grade solution favored by users for its durability and quick delivery. ## Description Compatible Battery Pack for the Visonic Powermax MCS-740 Siren. 2 Cell Pack complete Pack for Siren. This is the non-rechargeable battery for the totally wireless external sounders. The battery is supplied with the correct plug connector for the sounder. Manufactured by Wuhan Fanso. ## Features - ✅ System: Primary Lithium Thionyl Chloride - ✅ Type: Lithium Thionyl Chloride - ✅ Voltage: 3.6V - ✅ Capacity: 3.5Ah per battery - ✅ Complete Pack for Siren ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07NQK51WD | | Amperage | 3.5 Amps | | Antenna Location | Bicycle, Power Tool, Scooter | | Battery Capacity | 3500 milliampere_hour | | Battery Cell Type | Lithium Metal | | Battery Weight | 0.61 Grams | | Best Sellers Rank | 33,335 in DIY & Tools ( See Top 100 in DIY & Tools ) 32 in Sirens | | Brand Name | Visonic | | Compatible Phone Models | MCS 740 Siren | | Country of Origin | China | | Customer Reviews | 4.4 4.4 out of 5 stars (320) | | Item Weight | 0.1 Kilograms | | Manufacturer | Visonic | | Model Name | MCS 740 | | Number of Batteries | 1 Lithium Metal batteries required. (included) | | Reusability | Single Use | | Unit Count | 2.0 count | | Voltage | 3.6 Volts | ## Product Details - **Battery capacity:** 3500 milliampere_hour - **Battery cell composition:** Lithium Metal - **Brand:** Visonic - **Number of batteries:** 1 Lithium Metal batteries required. (included) - **Recommended uses for product:** Bicycle, Power Tool, Scooter ## Images ![Visonic Powermax Battery For MCS-740 Siren Pack of 2 - Image 1](https://m.media-amazon.com/images/I/51p0i3UGoIL.jpg) ## Questions & Answers **Q: Are the 2 batteries joined together? Thanks** A: You need to connect both batteries to the 2 connectors in the alarm sounder box. I was confused by this too but checked with my installer who confirmed you need to coo ecg both batteries. **Q: Panel not lighting up now after fitting the new battery’s in siren box** A: Was it lighting up before you replaced ? have you checked the cable connections. Process as per manual should be to ensure system not armed, (or it will sound the alarm siren) unscrew retaining bolt on siren case, remove case, disconnect old battery , connect new, replace case, do up retaining bolt. Job is complete, low battery warning message will disappear. **Q: Do you just clip new battery in** A: The Visonic Powermax Battery 2 Pack comes as a KIT For MCS-740 Siren, so you get 2 Batteries and a cable so you can just clip in, I have noticed that FANSO have also improved the life of this battery, This is the FANSO brand that I would recommend it also now has a higher capacity (higher Ah) battery, Using a battery with a higher Ah will improve the device's running time on a single charge offering longer life so means you will have to change less frequently and is recommended by Visonic. **Q: Any idea on the replacement process? Manual says just open the bell box but that will trigger the siren surely? Thats a lot of decibels to the face** A: The manual is quite correct. Ensure system not armed, (or it will sound the alarm siren) unscrew retaining bolt on siren case, remove case, disconnect old battery , connect new, replace case, do up retaining bolt. Job is complete, low battery warning message will disappear. ## Frequently Bought Together - Visonic Powermax Battery For MCS-740 Siren Pack of 2 - DURACELL CR2 (2 Pack) High Power Lithium Battery 3V (CR15H270) – Long life guarantee – For Alarm Motion Detectors, Thermometers, LED Lights & Electronics – 10 –Year Storage Guarantee - Leak Prevention - Panasonic CR123A - 3V Lithium Battery - Pack of 20 Bulk Batteries --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/107485610-visonic-powermax-battery-for-mcs-740-siren-pack-of-2](https://www.desertcart.sg/products/107485610-visonic-powermax-battery-for-mcs-740-siren-pack-of-2) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-11-06*