Hi Camineet,
You might get some clues from these:
Time-lapse tutorial (for when using time-lapse script), and
Turn off LCD during video on G9.
You can also use an approx 1/8" round piece plastic (or blank av plug) in the av connector to turn display off), this will help for
stealth mode
but won't save much battery.
You could also try this, (copied from that post), Write:
set_backlight(0)
exit_altto a plain text document and save it to your /CHDK/SCRIPTS folder on the SD card as "LCD Off.bas" , and load as per the
directions in the user manual (P36), Start the recording, and then press ALT and then shutter to run the script.
It might not be the most elegant way, but it may help. (
try at your risk, - has worked on my A720).