I recently stumbled across a lot of small scale RC planes using LiPo batteries and most of them had a charger integrated into the battery powered remote. Why waste batteries on charging when you can use an external power supply?
Click here to see the detailed tutorial on how to mod your Silverlit X-Twin remote to support external and internal power at the flick of a switch!
With smartphones getting faster and more capable you'd sometimes want to use them instead of buying another piece of equipment. That's the reason why I wanted to connect an external microphone for audio recordings to my smartphone.