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Battery level is always at 100%

Hi everyone,

I'm currently using nRF52832 with nRF5DK_V17.1.0 file. 

I understand that this question has been risen up quite a lot however, I still do not understand why the battery level remains at 100% even if I have powered my development kit with an external power supply, (supplying 2.5V) or with the USB connector.

I understand that the battery level will be ranged accordingly to the code that was written in "app_util.h" and you have to use the battery cell that was provided with the development kit.

I will be using the battery that was provided and I also have tried enable the notification in the Connect App first before reading the battery level and have tried amending the "battery_level_measur_interval" to a shorter time (20 secs)  however, in all scenario (USB, Battery & Power Supply), the battery level is still 100%.

I've also tested with the example "ble_app_proximity" but the results are the same.

 questions:

1. why did my battery level remains at 100% although i have tried with different power supplied methods.

2. is it possible for the battery service to read adc from other GPIO pins instead of the VDD.

Apologies for the a repeated questions in this forum, I'm really new to Nordic Programming and I've close to no programming background.

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