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Current version by: Dan ,

Text:

First you should get an app that can help you see the battery condition. Here's a free one: [http://www.coconut-flavour.com/coconutbattery/|CoconutBattery].
 
As to why your system is shutting down while it has still lots of power is often a messed up SMC. What happens it the SMC holds a high and low watermark (the batteries charge) so it can go into power save mode so yoyou don't loose what you are working on. I would reset it following this Apple T/N: [https://support.apple.com/en-us/HT201295|Reset the System Management Controller (SMC) on your Mac]. Then after your system is fully charged let it fully discharge at least two times this will reset the low water mark to be at the correct level.
As to why your system is shutting down while it has still lots of power is often a messed up SMC. What happens it the SMC holds a high and low watermark (the batteries charge) so it can go into power save mode so yoyou don't loose what you are working on. I would reset it following this Apple T/N: [https://support.apple.com/en-us/HT201295|Reset the System Management Controller (SMC) on your Mac]. Then after your system is fully charged let it fully discharge at least two times this will reset the low water mark to be at the correct level.

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Original post by: Dan ,

Text:

First you should get an app that can help you see the battery condition. Here's a free one: [http://www.coconut-flavour.com/coconutbattery/|CoconutBattery].

As to why your system is shutting down while it has still lots of power is often a messed up SMC. What happens it the SMC holds a high and low watermark (the batteries charge) so it can go into power save mode so yo don't loose what you are working on. I would reset it following this Apple T/N: [https://support.apple.com/en-us/HT201295|Reset the System Management Controller (SMC) on your Mac]. Then after your system is fully charged let it fully discharge at least two times this will reset the low water mark to be at the correct level.

Status:

open