--- product_id: 73060226 title: "The Basement Watchdog Maintenance-Free AGM Sump Pump Battery" brand: "basement watchdog" price: "¥156168" currency: JPY in_stock: true reviews_count: 8 category: "Basement Watchdog" url: https://www.desertcart.jp/products/73060226-the-basement-watchdog-maintenance-free-agm-sump-pump-battery store_origin: JP region: Japan --- # Up to 80-hour backup runtime Maintenance-free AGM tech Compatible with multiple BW sump systems The Basement Watchdog Maintenance-Free AGM Sump Pump Battery **Brand:** basement watchdog **Price:** ¥156168 **Availability:** ✅ In Stock ## Summary > 🔋 Stay dry, stay worry-free — power your peace of mind! ## Quick Answers - **What is this?** The Basement Watchdog Maintenance-Free AGM Sump Pump Battery by basement watchdog - **How much does it cost?** ¥156168 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/73060226-the-basement-watchdog-maintenance-free-agm-sump-pump-battery) ## Best For - basement watchdog enthusiasts ## Why This Product - Trusted basement watchdog brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Thousands:** 4.6-star rating from 700+ users who never want to be caught unprepared. - • **Extended Backup Power:** Up to 80 hours of reliable sump pump operation on a single charge. - • **Heavy-Duty Durability:** Robust 22.6 kg build designed to withstand emergency demands. - • **Seamless Compatibility:** Works flawlessly with both new and select older Basement Watchdog systems. - • **Zero Maintenance, Maximum Peace of Mind:** Forget adding acid or water—just install and protect. ## Overview The Basement Watchdog BW-27AGM is a maintenance-free AGM standby battery engineered to provide up to 80 hours of backup power for Basement Watchdog sump pump systems. Its robust design supports multiple models, including older units, ensuring reliable, long-lasting sump pump operation without the hassle of fluid maintenance. Highly rated and trusted, it’s the essential safeguard for any home’s flood protection setup. ## Description The Basement Watchdog Maintenance Free (AGM) Standby Battery for Backup Sump Pumps (BW-27AGM) - desertcart.com Review: OK battery for old Watch Dog back up sump pump - Worked with my old Watchdog battery back-up sump pump which is probably 15 years old. or more. (Yellow box and yellow pump, battery probe attaches to positive terminal to this battery to ) Nice that I did not have to add acid to the battery, but not keen about the battery terminals which are 2 bolts and 4 washers which are provided. Yes, it likely does weigh around 50 pounds. The extra $30 more I paid on desertcart than at a big box store 25 miles away was worth it to this senior lady! Review: Perfect replacement battery! - Excellent battery and easy to replace 8 year old battery that came with my original Basement Watchdog system. Love that it’s maintenance free and no acid or distilled water to add. ## Features - Maintenance free - no need to add battery fluid or distilled water - Up to 40-hour protection (based on a 10% duty cycle) on the Basement Watchdog Big Dog (BWD12-120C+) - Up to 48-hour protection (based on a 10% duty cycle) on the Basement Watchdog Special + (BWSP+) and Basement Watchdog Big Combination sump pump system (BW4000, CITS-50) - Up to 80-hour protection (based on a 10% duty cycle) on the Basement Watchdog Emergency (BWE) and Basement Watchdog Combination sump pump system (DFK961, CITE-33) - Runs various Basement Watchdog sump pump systems intermittently for days - Older versions, purchased before 2014 of the Basement Watchdog Special, Basement Watchdog Big Dog and Basement Watchdog Big Combo systems that include the Remote Terminal are compatible with the Basement Watchdog Maintenance Free/AGM Battery. Using a maintenance free battery with an older non-compatible system may cause false alarms. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B077XL42DJ | | Best Sellers Rank | #20,610 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Water Pump Accessories | | Brand | BASEMENT WATCHDOG | | Brand Name | BASEMENT WATCHDOG | | Color | Black | | Customer Reviews | 4.6 out of 5 stars 715 Reviews | | Included Components | GLENTRONICS - BW-27AGM | | Item Dimensions | 8 x 12 x 12 inches | | Item Type Name | GLENTRONICS - BW-27AGM | | Item Weight | 22.6 kg | | Item dimensions L x W x H | 8 x 12 x 12 inches | | Manufacturer | THE BASEMENT WATCHDOG Store | | Manufacturer Part Number | GLENTRONICS - BW-27AGM | | Manufacturer Warranty Description | Warranty | | Model Number | BW-27AGM | | Number of Items | 1 | | Number of Pieces | 1 | | UPC | 717301122538 | | Unit Count | 1 Count | ## Product Details - **Brand:** BASEMENT WATCHDOG - **Color:** Black - **Included Components:** GLENTRONICS - BW-27AGM - **Item Weight:** 22.6 kg - **Item dimensions L x W x H:** 8 x 12 x 12 inches ## Images ![The Basement Watchdog Maintenance-Free AGM Sump Pump Battery - Image 1](https://m.media-amazon.com/images/I/819dCJkLBCL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ OK battery for old Watch Dog back up sump pump *by H***Y on April 6, 2025* Worked with my old Watchdog battery back-up sump pump which is probably 15 years old. or more. (Yellow box and yellow pump, battery probe attaches to positive terminal to this battery to ) Nice that I did not have to add acid to the battery, but not keen about the battery terminals which are 2 bolts and 4 washers which are provided. Yes, it likely does weigh around 50 pounds. The extra $30 more I paid on amazon than at a big box store 25 miles away was worth it to this senior lady! ### ⭐⭐⭐⭐⭐ Perfect replacement battery! *by S***L on July 3, 2026* Excellent battery and easy to replace 8 year old battery that came with my original Basement Watchdog system. Love that it’s maintenance free and no acid or distilled water to add. ### ⭐⭐⭐⭐⭐ Ease of handling *by S***M on September 4, 2026* Shippped properly. Easy to handle and install. ## Frequently Bought Together - THE BASEMENT WATCHDOG Model BW-27AGM Maintenance Free (AGM) Sump Pump Battery - Wi-Fi Module 2.0 for Battery Backup Sump Pump Systems --- ## 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.jp/products/73060226-the-basement-watchdog-maintenance-free-agm-sump-pump-battery](https://www.desertcart.jp/products/73060226-the-basement-watchdog-maintenance-free-agm-sump-pump-battery) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-08*