Battery Test Results and Redesign

A project log for Car Journey Logger

A simple data logger that logs the time and date of ignition on and ignition off events.

David HopkinsDavid Hopkins 07/20/2015 at 10:090 Comments

Unfortunately, the battery tests were disappointing, only 33 hours...

assuming that the battery capacity was correct (1000mAh) and that all of it was used before the boost circuit collapsed...

1000mAh @ 3.7V = 3700Wh

3700Wh / 5V = 740mAh

740mAh / 33h = 22mA (AVG) spread across the booster, RTC , Arduino and SD card which isnt too bad really


The SD card will be turned around so that its accessable from the end with the USB port and the wires allowing the whole lot to be put into a tube of heatshrink.