I have had a nokia lumia 820 for over a year now with O2 and all of a sudden it ran out of charge and wouldn't charge up again. I replaced the battery with the exact same one which is a BP-5T 1650mAh 3.7V 6.1Wh. For a start when I put the battery in and charged it, it acknowledged that is was charging. So left it for a while, however the problem then occured again. I left it overnight to enable it to charge, seeing as it was new battery, however turns out it wasn't charging and now only has half charge, and tried to plug in a charger however phone is not recognising that there is a charger in. It is not the charger as have tried multiple ones around the house, and can now see it can't be the battery as replaced it and now isn't working. Is there any way of fixing it, and what is wrong with it?
Many thanks,

Jenny.