Electronics circuits - Battery Status Monitor by ICM7555 The low power LED flasher by ICM7555 Normally, when you need to use LED display status of the battery 6V-12V. Just add a resistor
A high power LED flashlight
2-Year Ultra Low-Power LED Flasher : 11 Steps - Instructables
Hobby Circuit - FLASHING LED POWER INDICATOR DRAWS LOW CURRENT s designed by David A. Johnson, P.E.
Low Power Consumption Indicator with Blinking LED – Deeptronic
MK180: Kit: 2-channel Hi-Power LED flasher at reichelt elektronik
Ultra Low Power LED Flasher using the Padauk PFS154 – Tim's Blog