What IDE you use?
most IDE i use dont conserve battery except android studio.
most ide run background job like intellisense it will eat battery juice too
for web browsing, use as little addon as possible, most addon are power hog as well.

Don't expect stella battery performance from x86 cpu, especially the thin one.
if the CPU does not have e-core then it will be worse.

either you get good lappy with high mah battery or get ios device/android.
intel/amd lappy power consumption efficiency still very far away from ARM devices.