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Teardown: Shargeek 300 24,000mAh Power Bank — Six Cells, Dual Buck-Boost Controllers, 140W Single-Port Output

2026-09-21 · Compiled by Best IT Parts from public industry reporting

A video teardown of the Shargeek 300, a 24,000mAh portable power bank, shows a battery pack assembled from six Ampace cells feeding a BMS that pairs an analog front-end with a microcontroller for cell monitoring and protection. The same board carries the charge and discharge path, the display driver and the overall system controller.

Power conversion centres on two Southchip bidirectional synchronous buck-boost controllers, supported by a step-down converter, a Chipsea CPW3221 USB PD controller and multiple MOSFETs. This arrangement delivers up to 140W from a single output port and 300W in total across the system, with the bidirectional buck-boost stage handling both charging and output regulation from one battery voltage.

A separate MCU working alongside NOR flash drives the display and user interaction, while overall logic control is delegated to a single CMS8S6990 microcontroller. Splitting the BMS analog front-end, the power conversion controllers and the housekeeping firmware across dedicated devices keeps the fast-charging path independent of the display subsystem.

For repair shops and distributors, the teardown is a useful reference for the component set inside a 140W-class 24,000mAh power bank: six cells, a multi-chip BMS, dual bidirectional buck-boost controllers and a dedicated PD controller. Those are the parts most likely to matter when assessing repairability, replacement stock and thermal behaviour in high-power portable storage, along with the heatsinking and thermal interface material around the buck-boost stage and the port connectors themselves.

Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.

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