I've used lots of battery powered little lights this year & left them glowing. (theinspiredroom.net)
On top of that, the iPad Pro has a Metal Oxide TFT Backplane that increases the light throughput for the panel and therefore increases its power efficiency, which is particularly important for such a large mobile LCD panel with a Backlight that needs lots of battery power to keep all of its LEDs shinning. (displaymate.com)
Besides current regulatory hurdles, one of the problems limiting drone deliveries is that drones require a lot of battery power and therefore can only stay aloft for a limited amount of time before running out of power. (fortune.com)