How to check whether the TV remote control's battery drained or not ?
       If the battery power is good,It will emits Infra Red rays. We can't see infrared rays normally.There is a way to see
this infrared rays. How???
Place the remote control's Infra red LED facing to the mobile camera, run the mobile camera in preview mode and press the keys in remote.
See the mobile camera's preview. If the battery charge is good, Infra red LED will emits light