MBP early 2011 starts only with battery disconnected

[okmacok]

Hello,

to make my MBP 2011 turn on I have to :

- disconnect the battery
- plug the power
- push the power on button
- let the mac start (it is SLOW without the battery)
- shut off the mac
- connect the battery
- push the power on button

and then Mac boots at normal speed.

BUT my problem is that when I shut off the mac again, I doesn't start anymore !
I have to redo the whole process to make it start again

Any Idea ?

I tried to reinitialize the SMC but it didn't help.

 

[New_Mac_Smell]

Probably a fault with the battery itself? It's 7 years old so way past an acceptable lifespan of ~5 years. Check Coconut Battery or something to see what the condition is.

There could of course be other faults within the power management, but a new battery would be advisable anyway so a good place to start. Check it for visual signs of swelling or anything else too.

 

[okmacok]

Probably a fault with the battery itself? It's 7 years old so way past an acceptable lifespan of ~5 years. Check Coconut Battery or something to see what the condition is.

There could of course be other faults within the power management, but a new battery would be advisable anyway so a good place to start. Check it for visual signs of swelling or anything else too.

Yes, I forgot to say that I bought a new battery. But it has never been totally discharged and I am doing it now.
I think that you are right. I should focus 1st on battery.

(I will try again with the genuine old battery too. It had bad condition but with a complete discharge/charge cycle I got the "OK" condition back).

 

[New_Mac_Smell]

Yes, I forgot to say that I bought a new battery. But it has never been totally discharged and I am doing it now.
I think that you are right. I should focus 1st on battery.

(I will try again with the genuine old battery too. It had bad condition but with a complete discharge/charge cycle I got the "OK" condition back).

There's not usually a need/good idea to purposefully discharge a modern battery, curious why you've done this? I suppose it could temporarily reset certain indicators and force it to work however this probably isn't wise.

So have you tried it with the new battery?

 

[okmacok]

There's not usually a need/good idea to purposefully discharge a modern battery, curious why you've done this? I suppose it could temporarily reset certain indicators and force it to work however this probably isn't wise.

So have you tried it with the new battery?

The new battery has the same result. This why I am deseperate
Actually I didn't put the old battery back for a while. I will do it later if nothing else works.

Purposefully discharge the genuine old battery helped me to get the condition status "OK" back.
Maybe discharge the new battery will help in my situation, just testing. Work in Progress.

 

[okmacok]

I discharged the new battery so the mac did sleep.
I put the magsafe. Iswitched the mac on : it started.

It is a good news because it means I can imagine a survival mode when I try to never switch off the mac.

Next step is to see if battery has a better behavior now.

 

[okmacok]

I changed the keyboard and everything is OK now. As if the Power key was the only problem.

It is very strange but maybe the Power never worked but I thought it did (it needs some time to make to start on when magsafe or battery is pluged)