Power bank module H961-U v6.1

Dimensions: 6.5 x 2.5 cm

Weight: 10.8 g

Continuous Current: 2.4A

Dual Output Current: 5V 2.4A

Input Voltage (B+ to B-): 3.0 - 4.2V

Overcharge Protection Detection Voltage: 4.20 ± 0.05V

Release Voltage: 4.100 ± 0.05V

Detection Delay: <200 ms

Over-discharge Protection Detection Voltage: 3.0 ± 0.10V

Release Voltage: 3.10 ± 0.10V

Detection Delay: <100 ms



The module is marked H961-U v6.1


Quiescent Current

The quiescent current from USB (when battery are fully charged) is 18.5 mA. The quiescent current drawn from the battery depends on the module’s state:

  • 26 mA — for a few seconds after activating the module via the button,

  • 15 mA — when the charge status display is on,

  • 3623 µA — display off, but 5V is present at the output,

  • 92 µA — the module has entered sleep mode.

Charging Logic

This module supports only standard 5V. There is no support for Quick Charge or Power Delivery.

Testing with Deeply Discharged Battery

The module features logic responsible for charging the battery when it is in a state of deep discharge. In this mode, it “gently” charges the battery with a safe current of 170 mA. The full charging current of 2.4A activates only once the voltage reaches 2.95–3.0V.

Testing in the 3.0–4.2V Range

The graph shows that CC (Constant Current) mode is used for charging from 3.0 to 4.05 volts. After that, it switches to CV (Constant Voltage) mode.


During this process, the module heats up to 75 C degrees.


Load Testing

This module can output only standard 5 volts. The allowable USB voltage tolerance is 5%, meaning the acceptable range is from 4.75 to 5.25 volts. The module is capable of maintaining voltage within these limits at currents up to 2300 mA, and, naturally, this depends on the battery charge level. The full graph can be seen below:


Next, I am interested in how the module heats up under load:


If the current does not exceed 2300 mA, the temperature peaks at 65 C degrees, which is even lower than during charging.

Next, let’s look at the efficiency graph as a function of load current:


It can be seen that the DC-DC converter operates most efficiently in the range of 300 to 1200 mA, with efficiency exceeding 92%.

Pass-through charging

The module supports pass-through charging. However, in this mode, power is distributed between charging and powering the load. Additionally, the output voltage drops momentarily when input power is connected or disconnected. I intended to use this module as a UPS for an Orange Pi. But such behavior makes this unsuitable — the Orange Pi will reboot during the switch.

Conclusions

The module is not bad, but I don’t see any practical use for it as a power bank. I am more interested in using it as a battery controller in portable devices. And the presence of a charge indicator is exactly what is needed.

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