Are you tired of bulky, inefficient power banks that don’t keep up with your MacBook’s power demands? Meet the DIY Battery Charger Case PD 100W Fast Charging for 4PCS 21700 Polymer 20000mA Battery Power Bank Box — a smart, customizable solution designed for tech enthusiasts who want maximum power, portability, and control.
This isn’t just another power bank — it’s a modular DIY kit that lets you build your own high-capacity, 100W Power Delivery (PD) fast-charging power bank using four 21700 polymer lithium-ion cells (each up to 5000mAh, totaling 20000mAh). The case is precision-engineered to securely hold and protect your cells while enabling efficient thermal dissipation and safe wiring — no welding required if you use pre-tabbed cells (though soldering is recommended for optimal performance).
With 100W PD output, this power bank can charge your MacBook Pro, Dell XPS, Lenovo ThinkPad, or any USB-C laptop at near-original charger speeds — perfect for travelers, remote workers, and digital creators who refuse to be tethered to wall outlets. The intelligent BMS (Battery Management System) ensures overcharge, over-discharge, short-circuit, and temperature protection, giving you peace of mind with every use.
The sleek, compact design fits easily in a backpack or laptop bag. LED indicators show real-time charge status, and the USB-C input/output port supports bidirectional fast charging — recharge the bank itself in under 2 hours with a 65W+ charger.
Whether you’re building a custom power solution for fieldwork, emergency backup, or just love the satisfaction of DIY electronics, this kit gives you pro-grade performance without the pro-grade price tag.
🔥 Special Offer: Get yours today for only $19.04 — a fraction of what you’d pay for a pre-built 100W power bank of this capacity. Don’t miss this limited-time deal!
✅ What’s Included:
- DIY battery case (holds 4x 21700 cells)
- PD 100W trigger module
- Wiring harness and connectors
- Heat shrink tubing and insulating pads
- (Note: Batteries not included — purchase 21700 polymer cells separately)
🔋 Why Build Your Own?
- Save up to 50% vs. retail power banks
- Customize capacity and cell brand (Samsung, LG, Panasonic, etc.)
- Learn valuable electronics skills
- Eco-friendly: replace cells instead of discarding whole units
Don’t wait — upgrade your mobile power game now!
Get the DIY Battery Charger Case Now
Get the DIY Battery Charger Case Now
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