Disconnect the charger and use a voltmeter to check the voltage aiming for an average reading of around 12.42V. If the voltage is lower recharge the battery for an additional 12 hours. The conduct a load test by reinstalling the battery and turning on high beams to verify its performance under load. Once the cells are empty, you want to mix half a gallon of distilled water with half of a pound of baking soda. Once these are mixed together, use your plastic funnel to pour some into each cell. Onc...