Question Replacement Lenovo Y50-70 laptop battery with external power supply

Mar 3, 2021
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I have a Lenovo Y50-70 laptop model 20378, which recently made a small explosion on the motherboard and since then the power supply with the adapter has not worked. I tried to repair or replace the motherboard, but it comes with a built-in processor and is very expensive for my buget.
I searched for various solutions on the internet until I came across this forum where I want to ask for advice on how to proceed. I would like to power this laptop through the battery socket from an external source (a power supply) but I got stuck, I connected on P + and P- to the battery socket the current specified on it of 7.4V but it did not start. I did something wrong?

Pictures:

https://prntscr.com/10cblod
https://prntscr.com/10cblkq
https://prntscr.com/10cbmie
 
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