In the CROSH terminal type in battery_test [<test length>] the test length is measured in seconds if no number is put in then the test length will default to 300 seconds
Welcome to crosh, the ChromeOS developer shell.
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crosh>
crosh> battery_test
No test length specified. Defaulting to 300 seconds.
Battery is discharging (96.75% left)
Battery health: 91.06%
crosh>
You can also use the command battery_firmware info to get additional information about your battery’s including serial number chemistry and design capacity