Here is some basic generic battery advise... (I worked for a battery company for 15 years)

1. Charge the battery..... with a 6 or 10 amp charger, just charge it untill it has reached peak voltage. This is usually above 15 volts. 15.5 is good. It might take 3 - 6 - 9 hours to reach peak voltage. If the battery gets hot, unplug it, let it cool, then charge again.

2. Let the battery sit overnight.....

3. measure the voltage