In version 1.16 : Battery of the control low

Hello ,

I have seen this issue a couple of times in the forum , but I couldn't find the correct reason in the answers .

When running version 1.14 on the ctrlX core : no problem , light pipe is green .

After updating to version 1.16 : warning 0C66003F  Battery of the control low , light pipe blinking yellow .

What is the reason that we don't get the warning with version 1.14 and we do get the warning with version 1.16 ?

And how can we solve the problem ?

Thank you .