--- product_id: 320185682 title: "3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement" brand: "hxjnldc" price: "€ 44.92" currency: EUR in_stock: true reviews_count: 6 url: https://www.desertcart.gr/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery store_origin: GR region: Greece --- # 3.7V nominal, 4.2V max voltage 620mAh high-capacity power Built-in multi-protection IC 3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement **Brand:** hxjnldc **Price:** € 44.92 **Availability:** ✅ In Stock ## Summary > 🔋 Power your smart life with precision and protection! ## Quick Answers - **What is this?** 3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement by hxjnldc - **How much does it cost?** € 44.92 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/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery) ## Best For - hxjnldc enthusiasts ## Why This Product - Trusted hxjnldc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Safety First Design:** Integrated Japanese Seiko IC protects against overcharge, overcurrent, and short circuits. - • **Reliable Power Boost:** 620mAh capacity fuels your devices longer without compromise. - • **Compact & Lightweight:** Slim 5×30×41mm size and just 13g—perfect for sleek, portable gadgets. - • **Universal Compatibility:** Seamlessly replaces batteries in Cozmo Vector, SkyBell HD, Flysight FPV, and more DIY electronics. - • **Precision Voltage Control:** 3.7V nominal with 4.2V full charge ensures stable, consistent performance. ## Overview This 3.7V 503040 lithium polymer battery delivers 620mAh capacity and 2.29Wh power in a compact 5×30×41mm form factor. Designed for Cozmo Vector robots, SkyBell HD WiFi doorbells, Flysight FPV wireless speakers, and compatible DIY electronics, it features a premium Japanese Seiko IC for overcharge, overcurrent, and short circuit protection. Lightweight at 13g, it ensures reliable, safe, and long-lasting power with a 1-year quality guarantee. ## Description Full description not available ## Features - Compatible with COZMO Vector robot SkyBell HD WiFi Video Doorbell Flysight FPV Watch wireless speaker Battery replacement。Also suitable for DIY electronic products with 3.7-5V and less than 2.3Wh 620mAh built-in 2-wire battery replacement.（★ Not applicable to high-power electric tools and model aircraft） - Please note that the specifications and polarity of the connector are based on the product display image,★the red wire is the positive "+" and the black wire is the negative "-"，Do not reverse-charge or reverse-connectreverse. ★The primary battery of some products has no plug or mismatched plug or mismatched polarity. It doesn't matter, you can cut and solder the plug directly or use our heat shrinkable insulating sleeve to connect the same color wire. - 503040 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 620mAh, power 2.29Wh, ★size 5×30×41mm(0.197×1.181×1.598inch）(T*W*L), Weight:13g(0.46oz)，Maximum current:0.6A。 It can prevent overcharge, overdischarge, overcurrent, and short circuit. - It‘s consists of of large-capacity A+ lithium battery, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-26 high temperature resistant silicone cable, and genuine JST Pitch1.25mm 2-pin connector module. - If there are any quality issues within a year, ★please feel free to contact us via email for replacement. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08PKV564B | | Batteries | 1 C batteries required. (included) | | Customer Reviews | 4.4 4.4 out of 5 stars (988) | | Date First Available | December 14, 2020 | | Is Discontinued By Manufacturer | No | | Item Weight | 0.704 ounces | | Item model number | 503040 | | Manufacturer | HXJNLDC | | Product Dimensions | 1.61 x 1.18 x 0.2 inches | ## Product Details - **Number of batteries:** 1 C batteries required. (included) - **Brand:** HXJNLDC - **Battery cell composition:** Lithium Polymer - **Battery capacity:** 620 Milliamp Hours - **Recommended uses for product:** Speaker ## Images ![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 1](https://m.media-amazon.com/images/I/61q7Lbqex6L.jpg) ## Available Options This product comes in different **Color** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Fitted without problems. *by J***D on Reviewed in the United Kingdom on 1 August 2021* Sony v3 headphones - Fitted without a problem. Slightly bigger dimensions of the battery (accounting for increased capacity over the standard), prove no problem. ### ⭐⭐⭐⭐⭐ As expected! *by D***H on Reviewed in the United States on 22 August 2024* Works flawlessly! I adapted it on a portable emulator console and it does the job. ### ⭐⭐⭐⭐⭐ Worked perfectly out of the box *by B***V on Reviewed in Canada on 5 August 2024* Installed in a pair of Sony WH-1000XM3s with no issues. Holds it's charge and works perfectly ## Frequently Bought Together - HXJNLDC DC 3.7V 620mAh 503040 Rechargeable Lithium Polymer Battery for Cozmo Vector Robot SkyBell HD WiFi Video Doorbell Flysight FPV Watch Wireless Speaker Battery Replacement - PKCELL N Size 1.5V Alkaline Batteries, 10 Pack Ultra Long-Lasting MN9100/E90/LR1 Medical Battery for Medical Devices, GPS Trackers, Flashlights, Key Fobs, 10-Year Shelf Life - Duracell N 1.5V Alkaline Battery, 2 Count Pack, N 1.5 Volt Alkaline Battery, Long-Lasting for Medical Devices, Key Fobs, GPS Trackers, and More --- ## 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/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery](https://www.desertcart.gr/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-04-23*