Samsung Moment

Hi! My name is DJuana and I have to say I am not very techie. I just need help and thought this would be the best way to get it. Right???

I have a Samsung Moment Android phone. Love it, love it, love it. Thought I would hate it. Right now I'm having problems. The phone won't hold a charge. I went to the Sprint store and the gave me a new battery. But I can txt 4 or 5 times and the battery is drained. And forget about opening apps or downloading. Drains out to yellow even if I've fully charged it. I'm going to have to hard reset aren't I? If this is true how can I save my stuff or should I take it to the store and let them do it? Help!

Thanks in advance for any help!