Add a `stop` method to `BatteryPool` #536

Job	Run time
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	3m 47s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_min)	15m 43s
Build distribution packages	19s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	2m 41s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_max)	15m 40s
Test documentation website generation	0s
Test package installation in different architectures	4s
Test with nox	1s
Cross-arch tests with nox	1s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	38m 16s

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