battery question

Is it normal for a battery to lose power while just sitting there not connected to a car or anything? yesterday it was reading 12.04 volts and today its reading 11.98 volts.

I know i have to charge it but im just wondering if this battery is gone because of the drop in voltage while not being in use.
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All lead-acid batteries (and probably batteries in general) self-discharge due to the chemical reaction that occurs inside a battery. The higher the temperature the faster the rate of discharge. What you're seeing is normal.