Ifixit sells very repuatble battery replacememts, i have one for my t440p! If ifixit doesnt sell it inland (microcenters brand) batterys work well and i have never had any issues with either.
this post was submitted on 07 Jan 2024
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As a data point, I have a Green Cell battery in my X220. I have bought the battery on July 24, 2022 and I have been using my X220 regularly but lightly. The battery was marketed as 6600 mAh at 10.8 V. As of writing, the OS reports design capacity of 73.26 Wh and current capacity of 60.6 Wh:
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=11100000
POWER_SUPPLY_VOLTAGE_NOW=11783000
POWER_SUPPLY_POWER_NOW=28726000
POWER_SUPPLY_ENERGY_FULL_DESIGN=73260000
POWER_SUPPLY_ENERGY_FULL=60600000
POWER_SUPPLY_ENERGY_NOW=54960000
POWER_SUPPLY_CAPACITY=90
POWER_SUPPLY_CAPACITY_LEVEL=Normal
POWER_SUPPLY_MODEL_NAME=45N1023
POWER_SUPPLY_MANUFACTURER=SANYO
POWER_SUPPLY_SERIAL_NUMBER= 9001
So 82.7% left after 1.5 years, that's cool I think!
(especially given that they offer only a 12 months warranty)
X220 uses 18650-cells, which are superior. Either he uses it always on charger or the cells are really bad quality.
Nevertheless, has nothing to do with your T480 since it has LiPo batteries, not 18650-celled.