PT12B-4The same convenience and technology as the Sealed Maintenance Free Batteries mentioned above, except this battery is sealed and activated at the time of manufacture. Very convenient to the point that all that needs to be done is put the battery into your vehicle and you are ready to ride. The only downside of this type of battery is that all batteries once activated have a shelf life, and if this battery is not going to be used right away, or be put in a vehicle that is not going to ridden on a regular basis, the battery will need to be kept charged on a battery maintainer.