The big Merits Pioneer 10 (S341/S347/S3471) scooter requires a set of two big 12 volt Group 24 batteries to keep it rolling.
We recommend a 24 volt 8.0 amp offboard charger for this model. Monster Scooter Parts has the batteries, chargers, tires, tubes, and much more for the Merits Pioneer 10 (S341/S347/S3471) scooter.