You need to get your new battery and when you connect it up and start the bike, With a multi meter, measure across the battery terminals using DC Volts range, As you rev the engine you should see the voltage rise to something like 14Volts and then stop there, If it rises continually as the revs increase you may have a problem with the Voltage regulator. Also watch out for any spilled acid in tha battery compartment, it will make short work of eating away at any metal it comes into contact with, especially if it gets wet The electrolyte (sulphuric acid) is highly corrosive and if spilled can cause extensive damage to your Bike, your clothes, your skin and in particular, your eyes. The neutralising agent to be used is a sodium bicarbonate solution (Baking Soda and water).