Another common reason for power banks to drain their capacity fast is the internal resistance of the USB cable. Generally speaking, all cables have a resistance that causes power loss. But in most cases, this goes unnoticed because the lost values are very small.
The battery drains more because of the wasted electricity caused by power loss. If you’re experiencing faster-than-usual depletion of your power bank’s battery, there are specific measures you can take to address this issue.
Many modern power banks have a low-power trickle-charge mode that has to be activated to charge devices that draw low current to prevent this kind of discharge. Problem with those is that you have to remember how to activate the mode when you need it! So, there you are. A cable with nothing connected to the other end can discharge your power banks.
You’re Using Fast-charging If both the power bank and the device being charged support rapid charging technologies such as Power Delivery or Qualcomm’s Quick Charge, the power bank’s battery will drain faster. Quick charge speeds the charging process by boosting the charging voltage, resulting in an increase in wattage.
Lightning cables, specifically USB-C to Lightning cables, draw a small amount of current when they are plugged into a USB-C port, and this can be enough to trick some power banks to stay switched on, slowly discharging it. This can be more of a problem with smaller capacity power banks than the big ones where the discharge is much less noticeable.
According to customer reports, when Lightning cables, especially USB-C to Lightning cables, are plugged into a power bank’s USB-C port, they drain a tiny amount of electricity, which can be enough to trick some power banks into remaining powered on and slowly discharge.
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