Nothing to do with uC: measuring parasitic draw from car battery

Author	Message
twofingers Guru Joined: 02/06/2014 Location: Germany Posts: 1769	Posted: 10:42am 16 Aug 2024         thwill said   ...The car battery went very very very flat whilst sat for a couple of weeks ( < 0.5V ), I did charge it back up but it then drained again in 4 days ... Tom   Quote   ... but it's also possible nobody has ever changed its battery which would be 10 years old ... Hi Tom, my guess: you should save up for a new battery! edit: To be clear: the battery is destroyed, buy a new one! Measuring with a 0.1 ohm resistor is a good idea (as long as you don't try to start the engine   ) Good luck! Michael Edited 2024-08-16 21:03 by twofingers