When eBikes Fail

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I had been riding my Specialized VADO SL almost every day this week. I have gotten lazy and used the battery. On each ride it would discharge from 150% (with the Axillary battery) to about 100%. I would charge it overnight. This morning it discharged. Instead of back to 150%, it was down to 18% and continuing to decline with no warning.

The bike had about 4600 miles with no problems. I do most of the mechanical repairs myself, but I don't have the equipment to test the electrical system. I have taken it back to Biker's Choice at 10:30 on 06/23/23. The bike is two years old and has never been back to the shop. I don't know what to expect. 

I like to take the bike on 700 mile tours. Why such a failure without warning that could be worrisome.