. 2023 Aug 30;16:e00469. doi: 10.1016/j.ohx.2023.e00469

Table 18.

Variable definitions, values, and source for battery life estimate.

Variable	Definition	Value	Source
$t_{a c t u a t i o n}$	Electromagnetic actuation time	40 ms	Design parameter
$N_{a c t u a t i o n}$	Number of actuations per day	1000	Design parameter
$t_{d}$	Time in day	86.4 $\times$ 10⁶ ms	–
$I_{c o i l}$	Electromagnet coil current	12.2 mA	Measured steady-state current
$t_{a}$	Processor active time	24 000 ms	Design parameter
$I_{a}$	Processor active current	0.2 mA	Product data-sheet [26]
$t_{i}$	Processor idle time	24 700 ms	Design parameter
$I_{i}$	Processor idle current	0.03 mA	Product data-sheet [26]
$t_{s}$	Processor sleep time	86.35 $\times$ 10⁶ ms	Design parameter
$I_{s}$	Processor sleep current	0.0013 mA	Product data-sheet [26]
$C_{b a t t e r y}$	Battery capacity	130 mA h	Product data-sheet [27]
$F O S$	Factor of safety	2	Selected parameter