Intel Lunar Lake

I would recommend buying an Intel Lunar Lake or upcoming Intel Panther Lake processor rather than the older Intel processors due to the huge jump in battery life.

For chip, Intel lunar lake is the best but others are fine too

Get laptop used Intel Lunar Lake processor for long battery life.

Intel lunar Lake is great.

The Intel Lunar Lake Core Ultra 7 200V chips will be the best on the market right now and will last you years.

If you want laptop has long battery life could get laptop used Intel Lunar Lake processor. The battery life comparable to Snapdragon laptop and MacBook M chip series.

AMD AI 300 chips and Intel Lunar Lake are nearly as power efficient, have much better iGPUs, and have none of the ARM incompatibility issues of the current Windows on ARM.

Second best choice is Intel Lunar lake, not AMD if we are talking about battery life for light usage. There is no match for it's idle/low power usage currently, among x86_64 CPUs.

The reviews about the Lunar Lake are damn good

The latest Intel Lunar Lake chips generally beat the AMD chips for battery life, all else (display, battery size) being the same. They aren't as powerful in multicore, but doesn't really matter for most users.