Remove the battery from MacBook Pro and charge it

Question

My friend gave me his laptop which is Apple laptop A1286 (MacBook Pro 15") with the charger but the head of the charger was cut. I tried to charge with another charger but, it doesn't charge.

Now, I want to remove the battery to charge it with external charger. What I mean is, to use the original charger and use the the (+)wire to the positive side in the battery and the (-)wire to the negative, but when I removed the battery I found many black wires and I didn't know which ones are positive/negative.

If anyone can help me with this issue or any way to charge the laptop without using the home of the charger on my laptop?

If I will charge the battery I will be able to reconnected again and check if it will work or the motherboard is damaged.

Answer 1

The positive (+) and negative (-) terminals on the battery are usually the outermost pins. Knowing the specific MacBook model is helpful here.

The MagSafe 1/2 charger outputs 16.5 volts, so you are going to need a charger that supplies that amount.

Now, with all of that said.....

I highly urge caution in attempting to hack a DIY charger for your MacBook Pro battery.

If you don't have the necessary electronics diagnostic/repair skills, this is not something you should be attempting. Besides, there is a more safe and reliable way to diagnose your problems...

You don't need a battery to test out your MacBook.

If you have a MacBook (any model - Pro, Air, etc.) that will not turn on even with the battery disconnected, the problem is with the DC-In board or the logic board itself. And even before you begin this diagnostic journey, you need to make sure that the MagSafe charger you are using is functioning properly. A dead AC adapter won't charge any battery regardless if it's in the laptop or not.