Yes, Intouchables is a solid movie, but for American audiences the only way you could have made it play out to racial movie stereotypes even more is to add monkey chants and a banana.
I find they do more harm than good. Just limit background processes, keep the brightness down, turn off any unnecessary functions like GPS, Bluetooth etc if they're not being used.
You can skip step 1 of course. The rest should be ok.
Imo, the highest battery drainers are the screen and background app syncing along with Wi-Fi and GPS being enabled when not in use. So reduce brightness and screen timeout limit, turn off auto sync for apps that you don't use frequently, enable Wi-Fi, Bluetooth & GPS only when needed. That should help.