2 
1 Failed (?) battery replacement in a Touchbar (2017) MBP
My mid-2017 15” Touchbar Macbook Pro was working fine, except the battery life was down to less than an hour. I replaced the battery with one from ifixit, following the repair guide at MacBook Pro 15" Touch Bar 2017 Vervanging van de batterij. Things seemed to go smoothly (and I had previously replaced the battery in my daughter’s similar machine successfully), but it now will not boot.
With power adapter not plugged in, hitting the power button results in a battery icon with a sliver of red with an icon of a plug with an arrow pointing to a lightning bolt below it. This displays for several seconds (and the haptic feedback on the touchpad is active during this time), and then the machine goes completely dead again.
With the power adapter plugged in, same thing but with just the lightning bolt icon below the battery icon. I’ve left it plugged in to the power adapter overnight with no change.
I’ve tried the resetting the SMC key combination, though I’m not sure if this actually does anything when the machine won’t even boot?
I’d like to hook the old battery back up temporarily to see if that fixes things but
a) I doubt it would because shouldn’t these machines boot when hooked up to power even with no battery? (and I’ve tried disconnecting both the big battery power connector and the battery board connector and get the same results).
and
b) It looks impossible to hook up the old battery without removing the new one because of the way the battery cabling runs, and I’m afraid I’d damage the new battery getting it uglued.
Further ideas?
Thanks.
Update (01/04/2021)
"All is well" may have been an overstatement.
It boots now, but says battery is at 1% and doesn't seem to be charging. Though it then dies immediately if I unplug the power cord. I'll try letting it sit plugged in for a while and see what happens.
Update (01/04/2021)
Indeed, all is not well.
It will boot now, with my power brick and my daughter's Apple OEM cable (my daughter's laptop charges fine with either brick and either cable). But the system doesn't seem to see the new battery at all: the MacOS System Information has the serial number, etc. from the old battery and says no battery is installed. Can't attach screenshots to a reply, but added to them to a separate "answer".
Can’t seem to add screenshots to a comment, so adding here as a separate answer showing the current status: boots and runs off the power adapter, but system doesn’t seem to see new battery at all:
Is dit een goede vraag?
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5 opmerkingen
Let's give this a try reset the SMC following this Apple T/N How to reset the SMC of your Mac
See if that resets things otherwise you'll need to contact the iFixit Store for an battery exchange.
door Dan
Thanks Dan! One whole thread has disappeared from this question, but I did try resetting the SMC and the result was that the system forgot all the old battery's info (appropriately) but it still does not recognize the new battery at all. I guess I'll try to get another new battery...
door krdkrdkrd
@krdkrdkrd - its all there ;-} I pulled one of the Update Labels combining the last two.
door Dan
Ah, right you are! Still learning how to find my way around these forums. Thanks again!
door krdkrdkrd
@danj, ifixit agreed to send out another battery. While waiting for it, I swapped my old one back in, and it works fine (except the battery life is less than an hour), so the problem definitely was a defective ifixit replacement battery. Thanks again for your help tracking that down.
door krdkrdkrd