If it was just the battery degrading, then that .5% to 5% is the battery draining 10x faster. Or, in other words, the battery has 1/10 of its original capacity. A normal usage of 7% in an hour on new would be more like 70%.
You made me look.
Apparently some degradation modes cause more "capacity fade" while others: more "power fade", i.e. the observed effects at .5% vs. 7% loads may well be different. They don't necessarily scale linearly either.