Using camera's rechargeable batteries is a good choice, mostly the batteries are good quality one. Mine using cheap batteries (the green one) that come free with wireless PC mouse (A4tech brand ). Even uses its rechargeable/wireless receiver to recharge it .

Don't pening2 kepalala...360's wireless controller is the bestla . No need to worry about slow response time, it using radio signal not infra-red, so no need to point it directly to 360's console.