--- product_id: 532380970 title: "21V 4.0AH Battery With Electric Quantity Display" brand: "shintyool" price: "NT$2701" currency: TWD in_stock: true reviews_count: 10 url: https://www.desertcart.tw/products/532380970-21v-4-0ah-battery-with-electric-quantity-display store_origin: TW region: Taiwan --- # 4.0 Ah High Capacity 21V Lithium Power Universal 100-240V Charger 21V 4.0AH Battery With Electric Quantity Display **Brand:** shintyool **Price:** NT$2701 **Availability:** ✅ In Stock ## Summary > 🔋 Power up your productivity—stay charged, stay ahead! ## Quick Answers - **What is this?** 21V 4.0AH Battery With Electric Quantity Display by shintyool - **How much does it cost?** NT$2701 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/532380970-21v-4-0ah-battery-with-electric-quantity-display) ## Best For - shintyool enthusiasts ## Why This Product - Trusted shintyool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power That Lasts:** 4000mAh lithium-ion cells deliver long-lasting energy for your tools, keeping you productive all day. - • **Smart Fuel Gauge:** 4-LED battery indicator lets you monitor charge levels at a glance—never get caught off guard again. - • **Multi-Layer Safety:** Built-in overload, overheat, and over-discharge protections ensure your battery and tools stay safe and reliable. - • **Universal Charging:** Supports 100-240V input with a flame-retardant shell and LED charging status for safe, hassle-free power-ups. - • **Wide Compatibility:** Works seamlessly with major brands and popular power tools like leaf blowers and mini saws—upgrade without limits. ## Overview This 21V 4.0Ah lithium-ion battery from SHINTYOOL offers robust, long-lasting power with a smart LED fuel gauge and universal charger. Designed with multi-protect safety features and broad compatibility across major power tool brands, it ensures reliable performance for leaf blowers, mini saws, and more. Lightweight and rechargeable, it’s the essential upgrade for professionals who demand efficiency and peace of mind. ## Features - ★【Compatible with More 】Our batteries are compatible with some major brands, for power tools bl1860b bl1850 bl1840 bl1850b-2 bl1845 bl1830 bl1820 bl1815 lxt-400 series please feel free to contact us for more model information. - ★【21 Volt Lithium Battery 】Battery voltage: 21v, capacity: 4000ah, type: lithium ion, made of 10 pcs quality lithium ion battery,4 LED fuel gauge power display,battery light won't light up unless you will press the battery button, in order to reduce battery. - ★【Charger 】Support 100-240v universal standard ac input voltage. 1a power adapter, US plug, flame retardant shell, led indicator to easily see the charging situation. - ★【Multi-Protect Safety System】This battery is equipped with overload protection, overheat protection & over-discharge protection. - ★【Note on Battery】In order to protect the battery, please do not charge more than 6 hours.Note: Please Fully charge the battery before its first use. Please do not charge the battery for overnight since it will badly damage the battery life. - ★【WE’VE GOT YOU COVERED】 Any Non-human Damage Or Any Reason You Are Not Completely Satisfied With Our Product, We Will Immediately Provide You A Full Refund ( Or Replace Your Item). - ★ Note: Our 21v battery is very similar to another 21v III battery, but the compatible tools and brands are different, please do not confuse and make a wrong purchase. Feel free to inquire to learn more. ## Technical Specifications | Specification | Value | |---------------|-------| | Amperage | 1 A | | Antenna Location | Power Tool | | Asin | B0B64631SL | | Battery Capacity | 4000 milliamp_hours | | Battery Cell Type | Lithium Ion | | Battery Weight | 1.4 pounds | | Best Sellers Rank | #119,029 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #1,182 in Cordless Tool Battery Packs | | Brand | SHINTYOOL | | Compatible Phone Models | Compatible: For ALLOYMAN, Aoben, seesill, AVHRIT, Inquire to learn more about compatible brands. | | Customer Reviews | 4.4 4.4 out of 5 stars (322) 4.4 out of 5 stars | | Included Components | Battery with Charger Adapter | | Item Dimensions | 4.7 x 3 x 2.8 inches | | Item Weight | 9 ounces | | Manufacturer | SHINTYOOL | | Model Name | bl1820 | | Model Number | B5503 | | Number Of Batteries | 1 AAAA batteries required. (included) | | Reusability | Rechargeable | | Unit Count | 1 Count | | Voltage | 21 volts | | Warranty Description | 1 yera | ## Product Details - **Battery Capacity:** 4000 milliamp_hours - **Battery Cell Composition:** Lithium Ion - **Brand:** SHINTYOOL - **Number of Batteries:** 1 AAAA batteries required. (included) - **Recommended Uses For Product:** Power Tool ## Images ![21V 4.0AH Battery With Electric Quantity Display - Image 1](https://m.media-amazon.com/images/I/61CR85EalrL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Charger and two batteries great find! *by on Reviewed in the United States April 9, 2026* Arrived on time. I fully charged both batteries. Using one now and it works fine! Reasonably priced for 2+ charger. ### ⭐⭐⭐⭐⭐ Nice fit. *by on Reviewed in the United States November 21, 2025* Ordered this to be a second battery for my impact I bought here on Amazon awhile back, but I could not find that impact brand here anymore. I was hesitant at first, but when I received it it fit like a glove and works well. Charged pretty fast too and has the power I needed. The correct mAh I was looking for too. ### ⭐⭐⭐⭐⭐ Arrived on time *by on Reviewed in the United States August 9, 2026* Exactly as described and what I needed ## Frequently Bought Together - SHINTYOOL 21V Lithium Battery with Electric Quantity Display, 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower and Mini Saw - SHINTYOOL 21V Single Port Rapid Charger Base, Fast Charger for 21V Lithium-Ion Battery (Battery Not Included) - SHINTYOOL 21v Lithium Battery - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower --- ## 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.tw/products/532380970-21v-4-0ah-battery-with-electric-quantity-display](https://www.desertcart.tw/products/532380970-21v-4-0ah-battery-with-electric-quantity-display) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-08-17*