When does the battery icon in deCONZ turn red?

Apologies if this is documented somewhere or has been asked and answered before:

In deCONZ, battery-operated devices such as motion sensors from e.g. IKEA or Philips/Signify have a symbol for the battery percentage remaining.

This symbol turns from bright green to intermediate colors to red.

What are the thresholds, e.g. when does the symbol turn red?
Are these thresholds identical for all battery-operated devices?

Thanks in advance,
Chris