pinebook pro does not turn on

[dsk70]

*******************UPDATE*********************
Added an attached image of the power bus cables for you
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Hi,

I found that the battery pack is evidently defective for my PBP. 

Note my post from yesterday: UPDATE - NOW POWERED UP VIA MAINS! Re: PBP No Power

So, I effectively removed the bottom cover tested many avenues that have been recommended as you did.

I then disconnected the battery pack bus from the main board and removed the battery pack from the chassis, then took the red and black bus that is under
the yellow sticker and its female end that is  hidden under a piece of black anti-static shielding tape on the laptop chassis.
They connect and will allow direct power to flow from your AC adapter to the main board.

TO DO THIS THE BATTERY MUST BE DISCONNECTED AND REMOVED FIRST!

Once you make the red and black direct power connection, then try long pressing the power button on your keyboard.

Hope this helps!

I am still trying to obtain feedback on how to obtain a similar spec replacement battery. 

But in the interim I was able to boot with direct AC adapter power and back to working with my PBP.