My regular steamdeck died on me a while back, did not charge anymore and did not power on. Was well out of warranty, messaged Valve, RMA'd it and got the repaired unit back. Zero cost. I'd just contact support and see what they say if you haven't already.
You need a Multimeter to test that. You use the two test leads and make contact with the battery. If you're interested in testing it we're all here to help.
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