hi there, never had problem with my mbp until today. had it more than 2 years. my battery health is 89% and cycles is 87. i mostly use the mbp with power plugged in. and today i've used it on battery for like 10 to 15 min, and shut itself down without warning. the battery was on 85% or more. i always get around 4 hours on battery. when i plug to the power, it doesnt do that. so i think the problem would be the battery. just don't understand why the battery suddenly have problem. please do you have any suggestion?