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Where did you get the battery?

Lenovo no longer sells T480 batteries afaict, and 3rd party vendors are a (dangerous) crapshoot.

I got an extended battery at Microcenter on clearance for $5 last year. Best Microcenter find ever.

My previous one came from ebay. As long as you don't buy one that's suspiciously cheap you should be good. Spend more than you think it's worth.

i-fixit sells Lenovo batteries, FYI. They may show as out of stock, but they replenish occasionally and you can be notified when that happens.