DIY 100W PD Power Bank Case Review: 21700 20000mAh DIY Box
Problem & Solution
High-capacity power banks capable of delivering 100W Power Delivery to charge laptops on the go are notoriously expensive. Off-the-shelf models often use sub-par internal cells that degrade quickly, leaving tech enthusiasts and mobile workers paying high prices for short-lived accessories.
This DIY 100W PD Battery Charger Case solves that problem by letting you build a custom high-power battery pack using your choice of four premium 21700 cells. By pairing top-tier battery cells with this robust 100W circuit board and shell, you create a personalized 20,000mAh powerhouse capable of keeping demanding laptops like MacBooks powered anywhere.
It removes the frustration of slow charging and unreliable pre-built battery packs. With basic welding or soldering skills, you get professional-grade laptop charging capabilities, total control over cell quality, and substantial savings.
Who Is It For?
This kit is designed specifically for electronics hobbyists, DIY builders, and tech enthusiasts who want control over the quality of battery cells inside their power bank rather than relying on mystery pre-assembled cells.
It is also ideal for digital nomads, engineers, and remote workers who need reliable, high-wattage USB-C Power Delivery for laptops and heavy-duty devices without paying inflated commercial retail prices.
Key Features
- 100W PD Fast Charging OutputRapidly charge power-hungry laptops like MacBooks and modern flagship smartphones at full speed.
- 4x 21700 Cell CapacityCreate up to a 20,000mAh portable battery pack using high-performance flat-top cells of your choice.
- Intelligent Power Management CircuitProvides built-in protection against overcharging, over-discharging, short circuits, and overheating.
- DIY Soldering AssemblyGives you complete freedom to select reliable, long-cycle battery cells for maximum longevity.
- Compact Travel-Ready ShellProtects your custom battery setup in a lightweight, durable outer enclosure suitable for daily carry.
- Multi-Protocol Fast Charge SupportEnsures optimal charging speeds across a wide range of USB Power Delivery and Quick Charge devices.
Pros & Cons
Pros
- Unbeatable value for true 100W PD output capability
- Complete control over battery cell selection and quality
- Substantial discount available off the original retail price
- Sleek and compact enclosure for convenient everyday transport
Cons
- Requires spot welding or soldering equipment to install cells
- 21700 battery cells are not included and must be bought separately
FAQ
No, this is a DIY enclosure and circuit board kit. You must purchase four 21700 cells separately to complete the build.
Yes, it supports up to 100W Power Delivery (PD), which is fast enough to charge most USB-C powered laptops and MacBooks at full speed.
Yes, this model requires soldering or spot-welding the battery terminals to the main circuit board for a safe, secure connection.
The board features integrated protection against overvoltage, overcurrent, thermal overload, short circuits, and cell imbalance.
Final Verdict
If you possess basic soldering skills and want true 100W Power Delivery on a budget, this DIY 21700 battery case is an outstanding choice. It bridges the gap between affordable DIY electronics and high-end laptop fast charging, giving you total control over battery quality and performance for a fraction of retail prices.