Don't use racing pads on a street bike, they'll never get hot enough to work properly. This means the battery. Check the electrolyte level often and keep it filled. Use only distilled water, NOT tap water. Tap water has minerals in it that will not do the battery any good.
Some bikes have charging systems that chronicaly over charge the battery.
These bikes all use the same basic engine and charging system. They all seem to put out too much voltage and will quickly boil the battery dry. There's nothing you can do about it as the charging voltage is fixed by the sealed voltage regulator. You can try a new voltage regulator but they all seem to do it. Just check the battery often.