You can snoop the script from [root tip] [Utility Script] Charger Notifier - battery state to get an idea.
If by battery health you mean compared to factory state you can use upower
upower -i /org/freedesktop/UPower/devices/battery_BAT0
Look at the battery properties
Example
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: Sunwoda
model: 5B11M90050
serial: 823
power supply: yes
updated: 2025-03-09T10:41:44 CET (17 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 20,05 Wh
energy-empty: 0 Wh
energy-full: 51,63 Wh
energy-full-design: 54,7 Wh
energy-rate: 6,511 W
voltage: 15,074 V
charge-cycles: 43
time to empty: 3,1 hours
percentage: 38%
capacity: 94,3876%
technology: lithium-polymer
charge-start-threshold: 75%
charge-end-threshold: 80%
charge-threshold-supported: yes
icon-name: 'battery-good-symbolic'
History (charge):
1741513274 38,000 discharging
History (rate):
1741513304 6,511 discharging
1741513274 6,536 discharging
1741513244 7,176 discharging
1741513214 8,279 discharging