--- product_id: 587878356 title: "HQRP 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT ADT" brand: "hqrp" price: "€ 48.87" currency: EUR in_stock: true category: "Hqrp" url: https://www.desertcart.gr/products/587878356-hqrp-3-6v-lithium-thionyl-chloride-d-size-battery-compatible store_origin: GR region: Greece --- # Up to 30 min Activation Time 14.5 Ah High Capacity 3.6V Lithium Power HQRP 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT ADT **Brand:** hqrp **Price:** € 48.87 **Availability:** ✅ In Stock ## Summary > 🔋 Power your security with confidence — never miss a beat! ## Quick Answers - **What is this?** HQRP 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT ADT by hqrp - **How much does it cost?** € 48.87 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/587878356-hqrp-3-6v-lithium-thionyl-chloride-d-size-battery-compatible) ## Best For - hqrp enthusiasts ## Why This Product - Trusted hqrp brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **High Capacity 14.5 Ah Battery:** Delivers extended runtime to keep your outdoor siren alert and active. - • **Smart Depassivation Activation:** Optimized startup process guarantees your device powers up smoothly within 30 minutes. - • **200 Days Warranty for Peace of Mind:** Confidence backed by HQRP’s trusted quality and customer support. - • **Perfect Compatibility with DSC & ADT Models:** Seamlessly replaces original batteries like ER34615M-T1 and WT4911 series. - • **Reliable Lithium-Thionyl Chloride Chemistry:** Ensures long-lasting, stable power for your security devices. ## Overview The HQRP 3.6V Lithium Thionyl Chloride D-Size Battery offers a robust 14.5 Ah capacity designed specifically for DSC ER34615M-T1, WT4911, WT8911, and ALEXOR wireless outdoor sirens. Featuring advanced lithium-thionyl chloride chemistry, it ensures reliable, long-lasting power with a smart depassivation process that activates the battery fully within 30 minutes. Backed by a 200-day warranty, this battery is the professional choice for maintaining uninterrupted security system performance. ## Description Buy HQRP 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT ADT: Horns & Sirens - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - NOTE: It can take a unit up to 30 minutes to fully depassivate a battery. HQRP® Battery Replacement; - Battery Voltage: 3.6V; Capacity: 14.5 Ah; Li-SOCI2; Lithium Thionyl Chloride; - Compatible with Original Battery; 200 Days Warranty! - Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 Wireless Outdoor Siren WT4911BATT ALEXOR ADT; - Please pay attention: After removing the battery, wait no less than 30 seconds before inserting the replacement battery. High-quality HQRP battery, designed to start working immediately after installation. If your device does not function right away, it may require a depassivation procedure to activate the battery fully. NOTE: Make sure to follow the steps below for a brand new battery on the unit or if a battery is being replaced. - The WT4911 could lose power prematurely if a brand new battery is not used. 1. Hold the tamper switch closed before plugging the battery in. 2. Plug in the battery AND continue to hold the tamper for 10 seconds before releasing it. 3. Once the tamper is released, after the initial 10 seconds, the siren flashes the strobe in several different patterns to indicate it is in depassivation mode. - 4. When depassivation is complete, the strobe lights shut off and the siren starts to beep 3 times every 5 seconds. NOTE: It can take a unit up to 30 minutes to fully depassivate a battery. If the WT4911/WT8911 determines that depassivation is not complete at the end of 30 minutes, it will automatically stop trying and beep once every 5seconds. If this occurs, the battery should be replaced. - 5. Push in and then release the tamper switch. The WT4911/WT8911 will go into a normal power up sequence with 6 short beeps and flashes of the strobe lights. 6. The WT4911/WT8911 is then ready to be enrolled on the system or returned into service; NOTE: It can take a unit up to 30 minutes to fully depassivate a battery. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CNTKRM7S | | Amperage | 14.5 A | | Antenna Location | 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT, wt4911 battery | | Battery Capacity | 14.5 amp_hours | | Battery Cell Composition | Lithium-Thionyl Chloride (Li-SOCL2) | | Battery Cell Type | Lithium-Thionyl Chloride (Li-SOCL2) | | Best Sellers Rank | #30,110 in Electronics ( See Top 100 in Electronics ) #111 in Security Horns & Sirens | | Brand | HQRP | | Customer Reviews | 3.8 out of 5 stars 170 Reviews | | Manufacturer | HQRP | | Model Number | 887774411222319 | | Number of Batteries | 1 D batteries required. | | Recommended Uses For Product | 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT, wt4911 battery Recommended Uses For Product 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT, wt4911 battery See more | | UPC | 887774225385 | | Unit Count | 1 Count | | Voltage | 3.6 volts_of_direct_current | ## Product Details - **Battery Capacity:** 14.5 amp_hours - **Battery Cell Composition:** Lithium-Thionyl Chloride (Li-SOCL2) - **Brand:** HQRP - **Number of Batteries:** 1 D batteries required. ## Images ![HQRP 3.6V Lithium Thionyl Chloride D-Size Battery Compatible with DSC ER34615M-T1 WT4911 WT4911B WT8911 ALEXOR Wireless Outdoor Siren WT4911BATT ADT - Image 1](https://m.media-amazon.com/images/I/61fEokIAnyL.jpg) --- ## 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.gr/products/587878356-hqrp-3-6v-lithium-thionyl-chloride-d-size-battery-compatible](https://www.desertcart.gr/products/587878356-hqrp-3-6v-lithium-thionyl-chloride-d-size-battery-compatible) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-13*