i've just change both the screen on one of my iphone and the battery too

iphone 6 plus, ori screen cracked, so since the battery also needs replacing i d.i.y both

bought at shopee, aaa screen for about rm62, battery rm40 + that glue sticker

open up the casing, took clear before photo of everything

for replacing the lcd screen remember to place all the screws properly,

i open the screws and place it in its correct order by having a cardboard to stick it in

for the battery just pulled the sticker glue slowly straight towards the bottom, not pull around the the battery / towards the side

then remember its correct position before sticking in the new sticker glue

both the lcd and battery replacement takes about an hour and a half, i guess others can do it much faster

good luck