Review on Bewinner Rechargeable Battery Pack for Xbox 360 - USB Charging Cable & Base - 4800mah Replacement Battery - Backup for Xbox 360 Controller by Daron Ellis

This product is made very cheaply. The batteries don't hold a charge for more than 15-20 minutes, the charging port only charges the back when it's in a certain position, and the extension cord that plugs into the remote doesn't work at all! not worth my money but refuse to send it back. All in all a bad product and has not been used.