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Yuasa YT4B-BS Motorbike Battery

Our Price:  £99.95(Inc. 20% VAT)(£83.29 Exc. VAT)



In stock, immediate despatch

Part Number:  YT4B-BS
Brand:  Yuasa
Voltage:  12v
Capacity:  2.3Ah
CCA Rating (EN):  40A
Weight:  1.1Kg
Length:  114mm
Width:  39mm
Height:  87mm

Yuasa Motorcycle Batteries



  • Spill-proof design to avoid any leakage
  • Advanced lead-calcium technology for improved starting power
  • Longer lasting design with reduced sulphation
  • Exceptional vibration resistance for the best reliability
  • Supplied with acid pack and installation instructions


  • Manufacturer:Yuasa
  • Battery Type Number: Yuasa YT4B-BS
  • Battery Type: Sealed 12V AGM maintenance-free battery
  • Filling Kit Included: Yes
  • Dimensions: 114mm x 39mm x 87mm
  • Capacity Rating: 2.3Ah
  • Cold-Start Performance CCA (EN): 40A
  • Maximum Charging Rate: 0.5 Amp
  • Weight (filled): 1.10kg
  • Terminal Layout: Left: + Right: - (With the terminals on the edge nearest to you)

CAUTION: Please be aware that if this battery is mounted on its side or at more than 30 degrees from vertical in your bike then you must leave it to stand in an upright position after you have filled it for at least 24 hours before you install it.

Replaces The Following Part Numbers

  • Varta 503 902 004
  • 503-902-004

Fits The Following Motorbikes & Scooters

  • Yamaha TTR50E
  • Yamaha YJ50R Vino
  • Yamaha Vino Classic

 To download the product data sheet click icon

 To download the product MSDS click icon

All prices include free mainland UK delivery - other than certain remote areas that may attract a delivery surcharge.

All Royal Mail deliveries are sent by first class post and are free to all UK postcodes.

Most UPS deliveries are free however remote areas may have a delivery surcharge; these are generally the Scottish Highlands and Islands, most off shore islands and a few other remote or inaccessible parts of the UK.

Certain products are unavailable for post/courier delivery due to restrictions on shipping hazardous substances; these will be available for collection only or in most instances can be shipped via specialist courier or pallet service at an additional charge.

If you have any delivery problems, require technical assistance or would simply like to speak to a human being then please call us.

For further delivery information click here


Does this battery come pre-filled?
No they are not pre-filled but they come with the filling kit and once filled they are sealed maintenance free for life. This means that your battery is totally fresh when you receive it and it's effective life only starts when you fill it.

How do I fill this battery?
We have a short video explaining how to fill a Yuasa battery - see video link below main image above..


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