Battery pack came in simple package, no instructions but easy to figure out. It seems to work fine. Charged over night, can't say yet about length of use before recharge. I'd recommend it. Better tan individual rechargeable batteries.
Never run out of battery power when you are about to score the winning point. Save money and protect the environment by using the rechargeable battery. Battery can also be charged through any USB port, included the USB port on the xBox 360 console. Fits directly into the existing battery compartment. Initial charge time: 8 hours. Battery Output: DC 2.4V. Capacity: 3600 mAh. Color: Black. Package includes: Rechargeable battery and USB charging cable. Accessory ONLY; xBox 360 console and controllers are not included. Compatible With: Microsoft: Xbox 360 / Xbox 360 Slim.