iOS 8 battery usage stats are relative

A Rego user just wrote in concerned that Rego was consuming 14% of his battery usage:

These battery usage stats in iOS 8 can be a bit confusing. You have to understand that they are relative numbers. In this case, assuming that his battery began the last 24 hour period with a full charge, then Rego’s usage is 14% of the 34% of his battery that was used, or about 5% in absolute terms.