To have the battery filled you would have to take it to a local motorist and they should be able to fill it for you.
Air Filter For Yamaha RD 250 LC 1980-1982
Motobatt MB5.5U AGM Gel Motorcycle Battery for Yamaha RD 250 LC 80-83
RD 350 LC ContiGO! Tyre Pairs 90/90-18 & 110/90-18 Yamaha RD 350 LC 1982
RD 125 LC ContiStreet Tyre Pairs 2.75-18 & 3.00-18 Yamaha RD 125 LC 1985
Motobatt MB5U AGM Battery for Yamaha RD 350 LC 85-91
Foam Air Filter JMP For Yamaha RD 350 LC YPVS 1983 - 1984