Battery Problem, MacBookPro

When I disconnect and work outside, very soon the computer shuts down as if the battery was low, even if it is at 70%.
Jean Guillaume Pyraksos wrote on :

Behavior is the following. I work with the battery connected, at 99%. When I disconnect and work outside, very soon the computer shuts down as if the battery was low, even if it is at 70%. I need to reconnect the battery, which charges up to 99%. It is an Apple refurbished machine. Any hint ? Thanks,

-JG

Mike Rosenberg replied on :

Jean Guillaume Pyraksos wissme@redacted.invalid wrote:

Behavior is the following. I work with the battery connected, at 99%. When I disconnect and work outside, very soon the computer shuts down as if the battery was low, even if it is at 70%. I need to reconnect the battery, which charges up to 99%. It is an Apple refurbished machine. Any hint ?

Did you follow Apple's instructions when you first got the MacBook to calibrate the battery? If not, try that now.

Jean Guillaume Pyraksos replied on :

Behavior is the following. I work with the battery connected, at 99%. When I disconnect and work outside, very soon the computer shuts down as if the battery was low, even if it is at 70%. I need to reconnect the battery, which charges up to 99%. It is an Apple refurbished machine. Any hint ?

Did you follow Apple's instructions when you first got the MacBook to calibrate the battery? If not, try that now.

I did not. Now, it does not work as the battery shuts down very quickly. Should I reset the PMU ? Can it hurt ?

-JG
nospam replied on :

In article wissme-D73164.17062711082007@redacted.invalid, Jean Guillaume Pyraksos wissme@redacted.invalid wrote:

Behavior is the following. I work with the battery connected, at 99%. When I disconnect and work outside, very soon the computer shuts down as if the battery was low, even if it is at 70%. I need to reconnect the battery, which charges up to 99%. It is an Apple refurbished machine. Any hint ?

if the machine suddenly shuts down when the battery has a 70% charge, then the battery most likely has a failed internal cell which caused the whole battery pack to drop below the necessary voltage to run the computer.

if it is under warranty (and refurbished ones have a full one year), then get it replaced. otherwise, you'll need to buy a new battery.