system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When a new computer has its battery fully charged and is properly shut down, 2 weeks later the battery is at 0%. Where does all that energy go?
gpt
Many devices have need to utilize power even when it is completely shut off, things like the internal clock. These will continually drain the battery, though generally slower than your normal usage, until there is no power to be had.

If your battery normally holds an 8 hour charge with constant, heavy use, then the low-power shutdown mode is using maybe 2% of the max power to drain in 2 weeks.

If that same heavy use kills your battery in 3 hours, then it's less than 1% usage in this mode.

But almost no modern devices turn *completely* off, and instead draw little bits of power to do things like see if the power button is being pressed, or run the GPS chip so the NSA can find you.