{"product_id":"21700-diy-power-bank-case-pd-20w-fast-charging-usb-c-kit","title":"21700 DIY Power Bank Case | PD 20W Fast Charge USB-C Kit","description":"\n\u003ch2\u003eBuild Your Own Portable Charger — No Soldering Required!\u003c\/h2\u003e\n\u003cp\u003eTake control of your charging setup with this \u003cstrong\u003e21700 DIY Power Bank Case\u003c\/strong\u003e. Designed for electronics enthusiasts and everyday users alike, this solder-free kit lets you assemble a compact, fast-charging power bank in minutes. Just drop in a single 21700 flat-head battery and you're ready to go — no wiring, no mess, no expertise needed.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZero Soldering Needed:\u003c\/strong\u003e Welding-free design makes assembly quick, safe, and beginner-friendly — perfect for DIY electronics hobbyists.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePD 20W Fast Charging:\u003c\/strong\u003e Supports Power Delivery up to 20W output, compatible with all mainstream USB-C devices for speedy, efficient charging.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-In USB-C Cable:\u003c\/strong\u003e Comes with a detachable Type-C dual-line cable (C-to-C) stored right inside — no more scrambling for a cable when you're on the go.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Disassembly:\u003c\/strong\u003e The snap-open shell makes it simple to swap batteries or repair the circuit board, extending the lifespan of your power bank.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Portable:\u003c\/strong\u003e Designed specifically for a single 21700 cell, this slim case slides into any pocket, bag, or commuter kit with ease.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Battery Indicator:\u003c\/strong\u003e Four LED indicator lights show real-time battery level — all four light up solid when fully charged, and a green light indicates active fast charging.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Protection Safety Circuit:\u003c\/strong\u003e Built-in overcharge, over-discharge, overvoltage, and overcurrent protection keeps your devices and battery safe at all times.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Battery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1× 21700 flat-head battery (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShell Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEco-friendly plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShell Colors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack \/ Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePorts\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB-A fast charge output + USB-C bidirectional fast charge + Built-in C-to-C cable\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V\/2A, 5V\/3A, 9V\/2.2A, 12V\/1.67A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V\/2A, 5V\/3A, 9V\/2.2A, 12V\/1.67A, 10V\/2.25A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePD 20W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Indicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-LED level display\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOvercharge \/ Over-discharge \/ Overvoltage \/ Overcurrent\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Power Bank Case (battery not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cp\u003eInsert your 21700 flat-head battery, paying close attention to polarity — the \u003cstrong\u003espring contact is the negative (–) pole\u003c\/strong\u003e. Secure the shell, and your DIY power bank is ready to charge!\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/sata-power-splitter-cable-1-to-5-18awg-hdd-ssd-extension\"\u003e1 to 5 SATA Power Splitter Cable 18AWG | HDD SSD Extension\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/usb-to-4-type-c-multi-charging-cable-1-to-4-splitter-cord\"\u003e1-to-4 USB to Type-C Multi Charging Cable | 4-Port Power Cord\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe battery handling and lithium-ion cell standards, visit the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does this 21700 power bank case come with a battery included?\u003c\/h4\u003e\n\u003cp\u003eA: No, the 21700 battery is \u003cstrong\u003enot included\u003c\/strong\u003e. You will need to purchase a single flat-head 21700 lithium-ion cell separately. Make sure to use a flat-top (unprotected or protected flat-head) 21700 battery for proper fit and performance.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this DIY power bank case support fast charging for iPhones and Android devices?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The case supports \u003cstrong\u003ePD 20W fast charging\u003c\/strong\u003e via its USB-C bidirectional port, making it compatible with most modern iPhones (iPhone 12 and later) and Android devices that support USB Power Delivery. The USB-A port provides standard fast charging output as well.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need any tools or soldering skills to assemble this power bank case?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely not! This DIY power bank case features a \u003cstrong\u003esolder-free (welding-free) design\u003c\/strong\u003e. Simply insert your 21700 battery, observe the correct polarity (spring = negative), and close the shell. No tools, no soldering iron, and no technical expertise required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I know when the power bank is fully charged or fast charging?\u003c\/h4\u003e\n\u003cp\u003eA: The case has \u003cstrong\u003efour LED indicator lights\u003c\/strong\u003e that display the current battery level. When all four LEDs are solid, the battery is fully charged. A \u003cstrong\u003egreen indicator light\u003c\/strong\u003e activates specifically when fast charging is in progress, so you always know the charging status at a glance.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does this 21700 power bank case come with a battery included?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, the 21700 battery is not included. You will need to purchase a single flat-head 21700 lithium-ion cell separately. Make sure to use a flat-top (unprotected or protected flat-head) 21700 battery for proper fit and performance.\"}}, {\"@type\": \"Question\", \"name\": \"Does this DIY power bank case support fast charging for iPhones and Android devices?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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