Add a `stop` method to `BatteryPool` #535

Job	Run time
Test documentation website generation	0s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_min)	15m 45s
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	4m 11s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_max)	16m 56s
Build distribution packages	23s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	2m 28s
Test package installation in different architectures	2m 40s
Test with nox	0s
Cross-arch tests with nox	0s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	42m 23s

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