I've got this cheap battery level indicator that has 4 battery level segments, it is connected to a 12V-18AH lead acid battery that I to charge my laptop and my 1W light bulb.
I really can't seem to understand the behavior of it, as soon as I plug the charger to charge the battery it goes full (4 segments on) instantly, then goes back to original state as soon as I remove it. And when I start charging my laptop, it always drops a segment, then goes back as soon as i remove it as well. I feel it's more of a load indicator?!
I would appreciate an explanation for this please. Sorry for my english.