100W power bank kit for 4x 21700 batteries

Product detailed description

The 100W power bank kit for 4× 21700 is a semi-finished product (case + electronics) from which you can build a compact power source with modern USB-C PD 3.0 and PPS. The construction is designed for 4S Li-Ion (3.7V cells in series) and uses an aluminum case with an internal plastic frame. Thanks to the bidirectional USB-C, the power bank can not only charge devices but also charge itself quickly (depending on the adapter and mode used). A display is included, showing the current voltage/current and charge status.

Specifications:

• Product type: power bank kit (case + board), requires assembly
• For cells: 4× Li-Ion 21700
• Cell connection: 4S (3.7 V × 4) – terminals B-, B1, B2, B3, B+
• Recommended cells: for 100 W mode, cells with higher discharge capability (min. approx. 15 A)
• Case dimensions: 105 × 48 × 48 mm
• Case material: aluminum alloy (outer) + plastic inner frame (ABS+PC)
• USB-C (Type-C) input/output: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/5A
• USB-A output: 5V/3A, 6.5–9V/2A, 9–12V/1.5A (max. 22 W)
• Automatic sleep: at current < 0.15 A
• Display: voltage and current display during charging/discharging + charge status
• Temperature protection (NTC): NTC probe must be attached to the cells
• Temperature behavior: during charging above 55 °C power reduction to 60 W, during output above 60 °C protective shutdown
• Fast charging protocols – board solution overview:
• Support:
  • QC2.0/3.0 3.3–20 V;
  • PD3.0/3.1 5V/3A, 9V/3A, 12V/3A, 20V/5A;
  • PPS 5–21 V/5 A (105 W);
  • AFC 9/12 V;
  • FCP 5/9/12 V;
  • SCP 3.3–12 V/4 A (40 W);
  • VOOC is not supported;
  • UFCS 3.4–5.5 V/5 A, 5.5–11 V/5 A, 11–21 V/5 A
• Important regarding performance expectations: "100W" for phones often means proprietary manufacturer protocols; this module primarily uses PD (typically for laptops). Phones typically charge at ~18–30 W, some can do more via PPS.
• Case capacity: typically 20000 mAh, 74 Wh (actual value may vary depending on the cell capacity used)

Package contents:

• Case (aluminum) + internal plastic frame (ABS+PC)
• Electronics / control and converter board
• Connecting wires for cell connection (B-, B1, B2, B3, B+)

Note:

• The product is not a standalone functional unit, requires professional assembly and correct connection; observe the connection order B-, B1, B2, B3, B+, reversed connection or incorrect order may damage the protection board.
• Photos are for illustrative purposes only and may differ slightly from the actual appearance of the product without changing its properties.
• 21700 batteries are not included in the package