The early 2015 model with an Intel Core i5 processor clocked at 2.7GHz achieved a single-core score of 3043 The latest 11" MacBook Air, and they really delivered on increased battery life

Unplug the power cable from your Mac. For 10 seconds, press and hold at the same time the shift control option keys (on the left side of the built-in keyboard) and the power button. After 10 seconds let go of all keys and the power button. Plug in the power cable. Turn your Mac back on with the power button.

Up to 18-hour battery life; MacBook Air (Intel, 2020) Up to Intel Core i7 processor; Intel Iris Plus Graphics GPU; Early 2024. The Apple Vision Pro AR/VR headset is set to launch in early 2024

However, the current 13-inch MacBook Pro with Retina display (13-inch, Retina, Late 2013) with its dual-core 2.6GHz Core i5 processor scored 6719 points in the same test. The 2014 11in MacBook Air
Not a 2015 but I did upgrade from a 2018 to a 2020 M1. A huge performance increase. My workflow in lightroom is more enjoyable now than on my MBA 2018 and my ryzen 9 built system. You should get really good battery life. I'm running at a little over 4 hours on a single charge.
What to Know. On average, a MacBook Pro is expected to last around 7–10 years and a MacBook Air for 5–7 years. MacBook longevity can be affected by the frequency of use, tasks performed, and the quality of care for the battery and other components. We’ll teach you some easy tips that can help extend the life of your MacBook.
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macbook air early 2015 battery life