harore wrote:
Hello..

I hope this post is related to this group because I think this is
about electronic a little bit.

Hmm, my car battery is almost dead. But, when I jumpstart it, it
starts well and the battery is also okay for another 2-3 start after
running it a while. Then, the next morning the car battery is flat
out. So, is there any method for me to revive the dead battery?
Because I think it is not fully dead yet, if I throw it, it would not
be good to the environment.

Thanks.

harore
http://www.hobbyelectroniccircuits.com

Sounds more like a shorted diode in the alternator or a light or a
device of some sort is not shut down overnight. I would measure the
current draw on the battery with everything shut down. Only a few
milliamps is normal, battery backup for computer memory, anything more
like an amp or more means a light is on somewhere, more than that would
be a Shorted Diode in the alternator.

Yukio Yano