Instruction:
●T-plug serial adapter allows for two battery packs to be connected serially. For example:

Two 6s (22.2v) packs can be serially connected to form 12s (44.4v) pack.
Two 3s (11.1v) packs can be serially connected to form 6s (22.2v) pack.

Specification:
●dimension: 72 x 21 x 17.7 mm
●Weight: 25g