6 model

Free

4S1P 18650 Battery Case

Thingiverse

Free

21700 4s1p 18000mAH battery pack

Printables

Free

21700 4S1P Battery Case

Thingiverse

Free

Powerbank (4s1p)

Printables

Free

100W PD Power Bank USB-C (IP2368, 4S1P)

Printables

Free

18650 4S 1P battery holder

Thingiverse