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Yuasa YB9-B Motorcycle Battery

 In Stock

Delivery to UK Mainland
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Today (Thursday)

Part Number:  YB9-B

£37.95 (inc VAT)


Brand:   Yuasa
Voltage:   12V
Capacity:   9AhHelpAmpHour or Ah measures the capacity of a battery.
In simple terms, the higher the Ah the more energy the battery can store.

If you imagine a bucket of water, the bigger the bucket, the more water it can store.

For example.
A 20Ah battery can normally deliver 1 Amp for 20 hours or 2 Amps for 10 hours. At extremes the performance usually drops, for example it may not deliver 20 Amps for one hour.

1Ah = 1000mAh
CCA (EN):   130A HelpCCA or Cold Cranking Amps, measures the starting performance of the battery.
In simple terms, the higher the CCA the easier it will start the engine.

There are several standards.

DIN German Industrial Standard at -18°C
EN European Standard EN50342.1 at -18°C
SAE American Standard at -18°C
Length: 135mm
Width: 75mm
Height: 139mm
Barcode: 4016987109458

Vespa Piaggio Scooter Battery YB9-B

Yuasa YB9-B Motorcycle Battery

YB9-B is a popular 12v 9Ah battery which was fitted as original equipment in a wide variety of popular motorcycles and scooters for many years.

It also replaces the older 12N9-4B-1 battery.


  • Manufacturer: Yuasa
  • Battery type number: YB9-B
  • Battery type: Dry charged battery
  • Filling kit included: Yes
  • Dimensions: 135mm x 75mm x 139mm
  • Capacity rating: 9Ah
  • Cold-start performance: 130EN
  • Maximum charging rate: 1 Amp
  • Weight (filled): 3.1Kg
  • Vent position: Right side (With the terminals on the edge nearest to you)
  • Terminal layout: Left: + Right: - (With the terminals on the edge nearest to you)

Replaces the following Part Numbers

  • 12N9-4B-1
  • 6H2P
  • 12N9-4B-1
  • 50914
  • Yuasa YB9-B
  • EB9-B
  • VARTA 509 014 008
  • 509-014-008

For a lithium iron upgrade please have a look at the Shorai batteries below.

This YB9-B battery also fits the following:
Make Model Make Model
APRILIA Red Rose 125 APRILIA RS 125 11 KW 125cc
APRILIA Tuono 125cc KAWASAKI BN125 A1-A2 Eliminator 125cc 01-04
NORTON Commando 750 PIAGGIO Fly 125
PIAGGIO Skipper 125 2T 125cc PIAGGIO Vespa ET4 LX 125cc 96-00
TRIUMPH Bonneville Tiger YUASA YB9-B

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