Convert battery_subsystem_example.md to battery_subsystem_example.ipynb #41

Job	Run time
pre_commit	16s
pre_commit	16s
test_ubuntu (oldest, 3.9, 1.20, 1.6, v2.9.1, 7.7, 3.27, 1.8.0, 0)	11m 46s
test_ubuntu (oldest, 3.9, 1.20, 1.6, v2.9.1, 7.7, 3.27, 1.8.0, 0)	11m 46s
test_ubuntu (dev, 3, 1, 1, v2.9.1, 7.7, dev, dev, 1)	12m 16s
test_ubuntu (dev, 3, 1, 1, v2.9.1, 7.7, dev, dev, 1)	20m 56s
test_ubuntu (latest, 3.10, 1, 1, v2.9.1, 7.7, latest, latest, 0)	10m 22s
test_ubuntu (latest, 3.10, 1, 1, v2.9.1, 7.7, latest, latest, 0)	10m 22s
	1h 18m 0s

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