Compatible Part Number: TLi028C7 Compatible Model: Al catel per 1A 1B (2020) phone FAQ: 1.Q:why battery don't hold a charge, how to fix it? A:this is new battery, for first use, we suggest buyer: Remove the battery for a while Install battery and full charge it by ac adapter Leave charger and let the battery drain to shut off Repeat above charging and discharging at least 2 times. you charge the battery when power lower than 20%. If available, connect ac charger when doing computer work. If run the battery shut down often, it will shorten the battery life. 2.Q:battery can't charge fully, how to fix it? A: Remove the battery for a while Install battery and full charge it by ac adapter Leave charger and let the battery drain to shut off Repeat above charging and discharging at least 2 times. 3.Q:Battery can't be recognised by my laptop, do i need exchange a new one, A:we met this issue before, maybe because of your laptop system, we suggest you can: Remove all battery drivers Remove battery Connect laptop using AC charger, double check no battery drivers installed Connect battery Drivers will install automatically Full charge the battery by ac adapter Leave charger and let the battery drain to shut offRepeat full charge and full discharge about 2 times. if still not be solved, please contact us and exchange a new one. 4:Q:Battery dies suddenly at about 20%, do I need to recalibrate? A:Kindly check the battery settings and BIOS, do reset something, then: Remove the battery for a while Install battery and full charge it by ac adapter Leave charger and let the battery drain to shut off Repeat above charging and discharging at least 2 times