Electronics Leds

Bright Ones

The ones with RS 4663532 absurb 20mA current. Therefore if 6 are used, it is 120mA current.
If the system is powered with 2 AAA batteries (paralell) and a typical capacity of this battery is 900mAh, then two batteries will give 1800mAh.
Therefore 6 leds powered with two bataries will hold for 1800/120 = 15h