Issue: The power bank stops charging from time to time. To resume charging, one has to disconnect and reconnect.
This happens when using a power bank to charge a small device (such as a wireless headphone or a smartwatch) that requires a low charging current. When a low-current device is connected, the power bank sends out a charge for a few seconds and then stops because it cannot detect the presence of any battery due to its small size. You can check the link below for more details:
Nitecore NB10000 G2 and NB20000 G1 have a low-current charging mode that can be manually enabled to alleviate the issue, but it also depends on how low the charging current needs to be. The minimum charging current to sustain the low-current mode is 60mA.
Nitecore NB10000 G3 and NB20000 G3 have an auto-enabled low-current charging mode. The power bank will not stop if the continuous charging current exceeds 60mA. (No user input is required in these two newer models.)
Are there still limitations when the power bank fails to charge certain small electronics?
1) If the charging current is below 60mA, the power bank will still stop charging.
2) Some devices, like the Apple Watch, use a trickle charge mode with a very low current for extended periods when its battery is almost full. This can confuse the power bank, causing it to stop charging.