Batter life

My laptop is HP Pavilion au620tx and it is not charging over 13 and sometime 16 percent. I tried updating microsoft ac adapter and microsoft ACPI. I reinstall both the drivers but nothing happens. So i tried calibrating the battery using F2 and it says AC adapter required to calibrate the...

I used my phones 1A (ampere) charger for my mother's Intex aqua 3g pro phone and it charged the phone faster than usual. But after using that, the battery started to drain fast like 1% for every 3 minutes. And if internet is on then it discharges 1%for 1 min. Can anyone tell me the problem...