Review on Dell Laptop Battery E6420, E5430, E6520 & More - Long-Lasting Power For Inspiron & Vostro Models by Travis Coffman

The first battery I received lasted around 50 minutes with my screen on lowest brightness. I had followed all instructions for conditioning the battery. 50 minutes is pretty useless, since it wouldn't even make it through one of my classes. I contacted the seller and they sent me a replacement. Funny enough, the replacement battery was different from the one I originally received.The original battery was the one shown in the picture, with the green rectangle on it. The replacement I received did not have the green rectangle. The replacement lasts just about 2 hours, which is closer to what I was expecting from other reviews.I'm giving 4 stars because the seller responded promptly, plus the battery is priced low. However, had I been stuck with my original battery, I would have rated it 2 stars. This isn't to say there is anything wrong with the green rectangle battery; just in my case, it wasn't performing as it should have been.