Piaggio 584810 Yuasa YB9-B Battery 12V 9Ah – Vespa, Liberty, Fly, Typhoon, Scarabeo, Aprilia and Gilera

This is the Yuasa YB9-B battery, 12V 9Ah, distributed by the Piaggio Group under part number 584810: a conventional lead-acid battery from the YuMicron series, with 115 A cold cranking amps and the positive terminal on the left. It is supplied dry, without acid, and is shipped only within Italy. Product code 584810.

✓ Key advantages

• Yuasa, the original factory part – this is the battery specified in the manufacturer's catalog under part number 584810, not an equivalent.
• 115 A cold cranking amps – enough to turn the starter motor even in winter and on vehicles that have been idle for a long time.
• Lead-calcium YuMicron series – loses less water and self-discharges more slowly than older lead-antimony models, so it handles long periods of inactivity better.
• One code for half the Group's range – the same battery fits Vespa, Liberty, Fly, Typhoon, Beverly, Skipper, X9, Hexagon, Scarabeo, Aprilia SR and RS, Gilera Runner, and DNA.
• Standard dimensions 135 × 75 × 139 mm – fits into the original battery compartment without any modifications.

Technical specifications

Vehicle compatibility

The list is taken from the official Piaggio and Aprilia parts catalog (B2B area). If you have any doubts, send us your scooter's frame number and we will verify the correct code for you.

Who it is perfect for

For those whose scooter no longer starts on the first try, whose dashboard lights turn off when pressing the starter, or whose vehicle is already dead after two weeks of sitting idle. On Vespa, Liberty, Fly, Typhoon, and Scarabeo models, the battery is almost always the first thing to check before considering the regulator or the starter motor. It is also the right choice for those looking to get a vehicle back on the road after years of inactivity: a dry-charged battery keeps well for a long time and is activated only when really needed, rather than aging while already filled on a shelf.

Frequently asked questions

Does the battery come with acid?
No. The battery is shipped dry, without acid: the electrolyte is a hazardous substance that cannot travel with the battery. It must be purchased separately at a workshop or battery retailer; a one-liter pack is needed to fill it.

Do you ship abroad?
No: this item is shipped only within Italy. This is a restriction related to the transport of lead-acid batteries. If you order from abroad, we cannot fulfill this order line, so please check before completing your purchase.

How do I put it into service?
Fill each cell with acid up to the UPPER LEVEL mark, let it sit for about twenty minutes, and perform a slow charge before installation. These operations should be done while wearing protective gloves and goggles, or handled directly by a workshop: sulfuric acid is corrosive.

Which vehicles does it fit?
The official parts catalog lists code 584810 for most of the Group's range: Vespa ET4, LX, LXV, PX, S, and Granturismo; Piaggio Liberty, Fly, Typhoon, Beverly, Skipper, Hexagon, X9, Zip, NRG, and Ape 50; Aprilia SR, SR Motard, RS, Sport City ONE, and Scarabeo; Gilera Runner, DNA, Coguar, and Storm. The table above shows the years and versions.

Does it fit in the original battery compartment?
Yes: the dimensions are the standard ones, 135 × 75 × 139 mm, and the positive terminal is on the left, just like the original. If you are replacing a battery different from this one, compare the dimensions and polarity before ordering: installing a battery with reversed terminals would require lengthening or shortening the cables.

How long does a battery like this last?
It depends almost entirely on how it is maintained. On a vehicle used regularly, three or four seasons are normal; for vehicles that sit idle, a battery maintainer is recommended, because lead-acid batteries are ruined by sulfation from sitting still, not by mileage.