Solderless 21700 Power Bank Case with Detachable USB-C Cable
Build a small USB power bank around a suitable cell you already choose, then replace the cell when needed. This solderless case takes one compatible flat-top 21700 lithium cell and includes a detachable USB-C cable. It is for electronics hobbyists; the battery is not included.
- ✅ Assemble without soldering the cell — The single-cell holder uses contacts in an opening case.
- ✅ Replace the battery when needed — The removable cover gives access to the compatible 21700 cell.
- ✅ Keep a short lead with the case — The detachable USB-C cable stores alongside the housing for compatible devices.
- ✅ Check the charge indication before leaving — Four indicator lights give a visible battery-level indication.
- ✅ Choose the case colour you want — Grey, black, orange and red are separate options rather than a multi-case set.
Choose the cell, keep the reusable housing
The case is specified for one flat-top 21700 lithium cell. Insert only a compatible cell with the correct voltage, polarity and current capability, following the housing instructions; the spring contact is identified as negative. The printed 5000 mAh graphic is not a supplied battery or a guaranteed capacity for a user-installed cell.
The board provides a USB output, bidirectional USB-C connection and detachable USB-C lead. USB-PD output up to 20 W is specified for compatible equipment. Other advertised maxima depend on the protocol, cell, cable and connected device, so they should not be treated as a universal charging rate.
One selected housing with charging circuitry and detachable cable is supplied; the cell, mains supply and device are separate. Grey and black use the illustrated original case style, while orange and red use the alternate lock-slider style. The gallery gives approximately 85 × 50 mm for the original style and 90 × 53 × 25 mm for the alternate; choose the option that suits your build.
The case is sold without a cell; printed capacity is not an included battery.
The detachable cable stays with the housing when packed.
The short USB-C lead can be removed for use with a matching device.
The solderless holder takes one compatible flat-top 21700 cell.
USB-PD output up to 20 W is specified with a suitable cell and compatible device.
Open the cover to access the cell rather than soldering it into place.
Check the exact cell fit, voltage and current capability before installation.
The orange/red case style has an attached detachable USB-C lead.
The alternate case uses a lock-slider layout and requires a separate flat-top cell.
Battery not included: one suitable 21700 cell must be sourced separately.
The battery compartment opens for replacement; follow the marked polarity.
The black option is one housing, not a complete battery pack.
The grey option has the original-style housing.
The original-style case shows USB-A and USB-C connections on its edge.
The cell door gives access without permanently soldering the battery.
The original-style housing is illustrated at approximately 85 × 50 mm.
The alternate style has a lock slider on the battery-compartment side.
The side button and indicator area provide controls on the alternate style.
The orange option uses the alternate housing and detachable lead.
The alternate style has a USB-C connection at the end.
The alternate housing is illustrated at approximately 90 × 53 × 25 mm.
Technical details
- Cell required: 1 compatible flat-top 21700 lithium cell; not included
- Assembly: solderless cell contacts
- Options: grey, black, orange or red; 1 housing per order
- Connections: USB output and bidirectional USB-C; detachable USB-C cable
- USB-PD output specified: up to 20 W with compatible cell and equipment
- Charge indication: 4 indicator lights
- Polarity note: spring contact identified as negative
- Original-style size illustrated: approx. 85 × 50 mm
- Alternate orange/red style size: approx. 90 × 53 × 25 mm
- Included: case with circuitry and detachable lead; battery, mains supply and device excluded
Choose a suitable cell and case style to build a compact power bank with an accessible, replaceable battery.
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