Descriptions:Why can' t I charge up to 99%: If it's a new battery, first install the battery and discharge it (that is, charge the phone), turn off the power inside, and then charge it again to balance it. 100%. If it is an old battery, discharge it first and then charge it again. If it still does not work, it is caused by large internal resistance and inconsistent capacity.Why is the display percentage inaccurate when the battery is just installed? It is obvious that only 50% of the battery is installed and 80% is displayed: the first time the battery is installed, the battery is discharged (that is, the phone is charged), and the battery inside is turned off, and then Charge the power supply once and balance it, and the percentage will be accurate. All digital display power supplies are like this.Specifications:Output voltage: 5VOutput current: 1A/2AFeatures: It can be connected to one lithium battery or multiple lithium batteries in parallel, the capacity does not exceed 200,000 mA, and the voltage is 3.-4.2V.Package included:Charging module*1