You can also perform a battery leak test by using a Voltmeter. Put your negative lead on the negative side of the battery and then use the positive lead to touch the top of the battery in different places. iirc you shouldn't get more than maybe half a volt at any point. Also, you battery may be reading 12.6 volts when you test the battery with your voltmeter, but you should try flipping your headlights on ( with the car off) as your 12.6 reading may be a surface charge only. if that's the case your light will quickly take the surface charge away and show you the real battery condition.

and as 1augapfel said
. The real test of a battery is the load test. You use a tester with cables and clamps to apply a large load to the battery while the built-in meter shows battery voltage. After 15 seconds of a heavy load (simulated engine cranking) the voltage should still be at least 10.5 volts.

 

I just assumed he was some one who just put a random place in for his location, guess i was wrong this go around.