My dual sim cell phone has one x-tra battery. I use only one for some time. suddenly, the phone doesn't show the blinking word " CHARGING" er when I plug the charger... I thought it was because of the usb cable. The charger has light which means it's ok. I tried to use the travel charger which was with the package of the phone when I bought it. No sign that it is charging.. so I replace the battery, still doesn't charge. The replacement battery has 2 bars so the cellphone works normally but when I try to charge, it doesn't too.