For sensors expected to last months or a year on batteries, though, suchas those used in security applications like window openings and motion detection, Bluetooth Smart is developing into a competitor to other low-power radios.
To be sure, increasingly capacious chemistry and materials are used to improve the capabilities of batteriessuchas switching from carbon-based anodes to silicon-based ones.
Lithium batteries are also commonly used in other planes, but these are much smaller batteries, running much more minor things suchas a small set of lights.