That sure sounds like a weak battery. Even though it's a new battery, it has to be charged after putting the acid in it. It should be charged for at least 5 hours with a trickle charger after putting the acid in. How sure are you that your charging system is working properly? If you haven't done this, you can attach a meter to the battery and start the bike. At 3-4k rpm you should see 13.5-14.5 volts at the battery if the charging system is working. If a good battery is run down by riding with a faulty charging system it will rebuild a bit of a charge after letting it sit for a while. That is another indication to me that you have a problem with the charging system.