Experienced a similar problem years ago and a dedicated mechanic finally found the problem.
After hrs. of checking, it turned out a wire connection on a gauge was loose and allowing the battery to discharge. Try checking your wiring connections for tightness behind the instrument panel.
Recently I replaced my car battery. Within 2 days it was dead again. It turned out that my trunk light was staying on all night. I tool the bulb out, jumped off my car and have had no problem since.
----Also keep this in mind. It happened to me fifty years ago when I was parking with a girl friend. The car was running and it just died. I called my dad and found the problem in two minutes. The battery terminals had become corroded and it killed the connection between the cable and the post. Clean the connection with baking soda and water and a wire pad. In those days we had metal bumpers. We had no jumper cables. After cleaning the posts my dad moved his car so it just touched my bumper. That was the ground. He then used a used piece of copper tubing which held between the two positive posts. That allowed me to start my car.We would have a battery shortage
Never heard of a half battery. I have heard of half battery life, meaning the battery is half charged. The voltage of any battery is the same at half charge as it is at full charge.
My 88 had the same problem. Turns out the alternator was not quite charging the battery to full level. The battery should be charged to 12.4 to 12.6V (room temperature, new battery=12.6V). Adding distilled water to the battery did not solve the problem (try this first). The alternator was only charging it to 12.1V.
Perhaps starter is weak. Have it tested for load and drag
Load test the battery at half of its cold cranking amp capacity. If it dips under 9.6v, replace the battery. If your battery is good, replace the ignition solenoid, it should be on the firewall somewhere near the passenger side.
YOUR ALTERNATOR IS BAD THE REGULATOR INSIDE THE ALTERNATOR HAS SHORTED OUT BUT MOST OF THE TIME IT WILL STILL CHARGE
Dry and wet, web would be like a lead car battery acid which is liquid inside of the battery that keeps the lead plates charged inside, dry battery would be what you use inside of your remote for tv if you cut them in half nothing will poor out because its dry acid. Very nice question
It means, that the battery is half empty. And you might want to consider charging it soon.
probably your battery is going bad - but could be the alternator as well.
Half of 256 is 128 - whether to a division problem or any other.
Check for spark and fuel
Most Likly a fuel sender problem