Despite the extra capacity, the 16e does consistently worse than the 16 in our testing, and we have the older display to blame for the on-screen tests, while the shorter call time can probably be attributed to the new modem.
Either way, the iPhone 16e doesn't last nearly as much as others in gaming - among iPhones and Androids alike. Video playback is also behind the curve, though not by as much. The web browsing result, on the other hand, may be shorter than on the iPhone 16, but it's better than direct competitors from Samsung and Google, so there's that.
All things considered, we got an Active Use Score of 11:53h on the iPhone 16e - a classic case of 'not great, not terrible'. The Galaxy S25 and a Pixel 9 scored a little better overall, while an iPhone 16 will likely bring you a more tangible longevity improvement.