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It worked smoothly! Less than 15 minutes. I used a OEM-battery, instead of an original one.
Took me less than 10 minutes to complete. Computer rebooted as soon as put the MagSafe connector. I had to force a synchronization of the date/hour in Preferences to get it up-to-date (I guess the system would have done automatically a little bit later).
The battery came from iFixit. Battery stats, as shown by Battery health https://fiplab.com/apps/battery-health-f... show now:
Original max: 4680 mAh, Current Max: 4758mAh; Health: 102%, OS X Health Status: Good
The battery came is reported to be 3 years old(!) and came at about 80% charge
Instructions are very clear!
I did not manage to get the screws out with a Phillips #000 Screwdriver; I used instead the J1000 head of the all-new pro tech toolkit
I think I found the way to have the new battery to charge!!!!!
Essentially, you have to follow a very precise order: 1/shut down the computer, 2/take off the magsafe connector, 3/remove the old battery, 4/put back the magsafe connector, 5/put the new battery, 6/power on, each time leaving a few seconds in between.
I just replaced the battery as indicated (with a iFixit part), but the computer says there is no battery connected, even after letting the power plug in for more than one hour.