--- product_id: 179946739 title: "Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module" brand: "comimark" price: "£9.37" currency: GBP in_stock: true reviews_count: 3 url: https://www.desertcart.co.uk/products/179946739-comimark-1pcs-mcp73871-usb-dc-solar-lipoly-lithium-lon-polymer store_origin: GB region: United Kingdom --- # Integrated system load sharing USB & solar/DC power compatible 1.8A max input current Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module **Brand:** comimark **Price:** £9.37 **Availability:** ✅ In Stock ## Summary > 🔌 Charge smarter, power longer — the future of battery management is here! ## Quick Answers - **What is this?** Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module by comimark - **How much does it cost?** £9.37 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/179946739-comimark-1pcs-mcp73871-usb-dc-solar-lipoly-lithium-lon-polymer) ## Best For - comimark enthusiasts ## Why This Product - Trusted comimark brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flexible Power Inputs:** Seamlessly switch between USB port, AC-DC adapter, or solar/DC sources for ultimate versatility. - • **Smart Current Control:** Voltage Proportional Current Control prioritizes system load over battery charging for optimal efficiency. - • **Precision Charging Options:** Preset high-accuracy charge voltages with programmable fast charge current from 50mA to 1A. - • **Built-in Safety & Protection:** Includes reverse discharge protection, thermal regulation, and undervoltage lockout to keep your battery safe. - • **Power & Charge in Perfect Harmony:** Simultaneously powers your device while charging the battery, so you never miss a beat. ## Overview The Comimark MCP73871 is a compact, integrated Li-Ion/Li-Polymer battery charge management module designed for professional-grade power solutions. Supporting up to 1.8A input current, it intelligently balances system load and battery charging with advanced safety features and multiple power source compatibility, including USB, AC-DC adapters, and solar inputs. Ideal for GPS, smartphones, and portable electronics, it ensures efficient, reliable, and precise charging in a sleek 4x4mm QFN package. ## Description Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module ## Features - Integrated System Load Sharing and Battery - Integrated System Load Sharing and Battery - The MCP73871 device is a fully integrated linear solution for system load sharing and Li-Ion / Li-Polymer battery charge management with ac-dc wall adapter and USB port power sources selection - Package Included: 1 x MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module - If You Are Not Satisfied with Your Purchase for Any Reason, Please Feel Free To Contact Us at the Buyer Center or Support Email, 24/7 Quick Reply. ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | Comimark | | Item model number | LY340 | | Item Weight | 0.634 ounces | | Package Dimensions | 4.8 x 3 x 0.3 inches | | Manufacturer | Comimark | | ASIN | B07V4PHKNX | | Date First Available | July 11, 2019 | ## Product Details - **Brand:** Comimark - **Item Weight:** 0.02 Kilograms - **Output Voltage:** 4.2 Volts (DC) - **Specification Met:** UL, FCC - **Input Voltage:** 240 Volts ## Images ![Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module - Image 1](https://m.media-amazon.com/images/I/61CJLJHPT6L.jpg) ## Questions & Answers **Q: What is the pinout of the header?** A: I used the pinout shown on this link:https://www.amazon.com/dp/B07V4PHKNX?ref_=pe_527950_33920250_dpLink ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works as expected, quite well. *by P***I on June 14, 2025* Does what it was designed for which is why I bought it. I'm just developing my project, but once I've settled on the design, I'll probably remove the status LED and make other minor changes to save energy. I will eventually optimize the design for low energy consumption and improved efficiency. ### ⭐⭐⭐⭐ Fine for the price. Little time with the datasheet available online made it pretty clear to use. *by F***N on August 18, 2022* Yeah, some documentation would have been nice but the data sheet is available online for the chip. ### ⭐ Missing documentation *by T***0 on April 25, 2021* Package arrived today; no documentation of any sort. No contact information; only two bar codes with no meaningful imformation. Header pins; no way to indentify header pin, connection uses. No imformation about thermistor selection. ## Frequently Bought Together - Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module - Dorhea MT3608 DC-DC Step Up Boost Power Converter - 2A Module, Adjustable Step Up Voltage Regulator Board - 2-24V to 5V-28V Output Voltage (Pack of 10) --- ## 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.co.uk/products/179946739-comimark-1pcs-mcp73871-usb-dc-solar-lipoly-lithium-lon-polymer](https://www.desertcart.co.uk/products/179946739-comimark-1pcs-mcp73871-usb-dc-solar-lipoly-lithium-lon-polymer) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-01*