Pack of 2 FSC Rechargeable Replacement Battery Pack for XBOX 360 Controller White

UPDATE 1: (28NOV2017) (-2 stars, new rating is now 1-star)One battery arrived defective and wont charge. I just now went to use the second battery which I believed was charging for hours (green LED light on), only to find out it is completely dead, and never charged at all. Defective product.------ORIGINAL REVIEW: (27MOV2017)Game played 8 hours straight, and the battery is still charged. Quite amazing.One problem... You can't tell when the battery is fully charged, when charging (minus 1-star). I thought these were standard batteries that you stick into a charging pack, but they're not. Each battery has a micro usb charging port on the front of it, along with a L.E.D. You attach the supplied usb-a/micro usb charging cable directly to the battery, and then plug the usb-a part into a 5 volt charging adapter (same as cell phone charging plugs/adapters). The L.E.D immediately lights up green (indicating) a charge is in progress, but never changes it's color, even with a completely drained battery. I feel a drained battery should display a red L.E.D, and then green when it's fully charged, but it doesn't. You have to guess and hope that it's fully charged. Mine died in the middle of gameplay because I thought it was fully charged, but it was wasn't.Now that I think about it, minus another star. If I guess wrong again, and it halts my gameplay again, I'll deduct another star, because this is dumb. I shouldn't have to guess.Great battery life FiveStarCases, but you need to fix the L.E.D color issue. Think "red light, green light."