A few weeks ago, I lost my phone charger for my Samsung Rant cell phone. My sister has an LG Lotus, and i noticed her charger fit in my phone, so I used it because I needed to charge my phone. It worked well for a while, but the past two times I charged it, the battery died after about a day. Did I ruin my battery by using the wrong charger, or can I just go to the sprint store and get a new charger? Can someone please help?