Vespa ET2 | ET4 | LX 50 | GTS clock battery change with 1.5 V AA battery - YouTube
Battery 12V/9Ah, YB9-B also for Vespa PK50-125 S/PK50 SS/XL/N/Plurimatic/PK 125 ETS/N/XL/XL2 135x75x140 mm standard battery, dry pre-charged white | SIP-Scootershop
AF1 Racing. Clock Battery For Vespa's and Piaggio's