20,000mAh Power Bank: Balancing Capacity, Portability and Battery Protection

A Common Industry Challenge

Lithium battery products need more than sufficient capacity. Their protection systems commonly monitor conditions such as overvoltage, undervoltage, charging and discharging overcurrent, and short circuit.

These are standard battery-pack protection considerations rather than defects specific to an individual customer product.

What the Customer Needed

The customer wanted a 20,000mAh portable power bank combining high capacity with a practical form factor, efficient charging and battery protection.

Battery cells, power management and mechanical packaging therefore needed to work within limited internal space.

How Tongyong Industries Addressed It

Tongyong Industries optimized battery-cell selection, internal layout and the power-management circuit and integrated a battery management system.

Protection included overcharge, over-discharge, short-circuit and overheating functions. Production validation included capacity, charge-discharge cycle and safety checks.

The Result

Capacity reached 20,000mAh, while energy conversion improved by 18% compared with the original approach.

A complete charging cycle was achieved within six hours, with service life exceeding 500 cycles.