How long is the notebook battery 87% healthy?

Half a year. If the health has just dropped to 87%, then it can be used for 340 times, that is, half a year, if it is replaced by 70% of the health, charging and discharging 1 time a day, charging and discharging for about 20 times, and the health drops 1 point. The service life of computer batteries can be 3-5 years. The service life of computer battery depends on the brand and usage of the battery. Different brands of batteries have different service lives.