MacBook Pro powers off with good battery

Tyler Campbell wrote:

Recently, while on battery, my MacBook Pro powers off with plenty of juice left in the battery. Just this morning there was 77% battery when it powered off. When I tried to restart with battery power the icon of low battery (red) appeared indicating to plug it in to the charger. When I plugged it into the charger it turned on showing 77% battery level . . . it has subsequently charged to 100%.

The MB Pro is late 2013 and the cycle count in battery information is 688.

Try resetting the SMC https://support.apple.com/en-us/HT201295