Ouch. But 1.5 hours was very typical for desktop replacements. And most batteries fail to be much more than 15 minute wonders at 18 to 24 months.

A big ouch is if the battery failed in a bad way. That is some cell shorted out internally and causes the charging circuit to overheat and fail. What I usually find is that people leave the failed battery in the unit and don't think it can hurt the circuits. Sadly the repair is to replace the motherboard. Which runs about 1/2 the price of a new laptop.

Time to call it in and discuss the options with Dell.

Bob