Add `BatterySize` enum #5904

Job	Run time
shared-ci / Prepare base dependencies (3.12)	3s
shared-ci / Prepare base dependencies (3.13)	13s
shared-ci / Run pre-commit	19s
shared-ci / Run tests Python 3.12	37s
shared-ci / Run tests Python 3.13	42s
shared-ci / Process test coverage	13s
	2m 7s

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