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YUASA Battery YB4LB-12V YuMicron - Dry Cell, Includes Acid Pack 4220321

Battery Yuasa YB4LB-12V YuMicron - Dry Cell/ Includes Acid Pack (10). Also available in set case quantities of 10.
  • £13.86 (Exc. VAT)
Order within for delivery from Tuesday 5th July
+ In Stock Now   |   Usually dispatched within 24 hours
CLICK & COLLECT ONLY Select your local dealer on checkout
FIND A STOCKIST Find your nearest dealer (not limited to Click & Collect)
TRADE CUSTOMER? Request an account application form

Any batteries with acid packs will be filled prior to collection to comply with the government regulations. This may incur an additional charge for click and collect, please check with your chosen collection point/dealer prior to ordering.

Please note: This battery should never be fitted on it's side. It is only suitable for vertical fitment
  • Most problems with batteries today are due to improper initial activation
  • Newly activated batteries should ALWAYS be CHARGED before you install them into any motorcycle, otherwise they will lose at least 20% of their capacity
  • This will definitely result in a much shorter service life or other battery problems
  • Fill the battery to the indicated level
  • Charge the battery for three to five hours at the current equivalent of 1/10 of its rated capacity to get a full charge.
  • Failure caused by incorrect activation or charging is NOT a warranty issue

Further research by GS-Yuasa shows that 95% of alleged problems occurring with batteries that have been in service for more than a couple of months and have been left standing without charge are caused by SULFATION. This is a condition where a crystal like material forms on the lead plates. When this chemical reaction happens, it is impossible to restore a full charge and the battery has to be replaced. This is NOT caused by a faulty battery, it is a fault with maintenance. Please ensure batteries are kept charged on a suitable charger when not in use
This battery can be replaced by YT4LBS 4220450GTX4LBS4210450PTX4LBS4200360YT4LBS4230355LTX4LBS4230640

Fitment Summary:
For full fitment details in a searchable list please check the FITMENTS tab.

  • PGO: Big Max 50
  • Suzuki: AY 50V, AY 50 WR K1, AY 50 WR K2, AY 50 WR K3, AY 50 WR K4, AY 50 WR K5, AY 50 WR K6, AY 50 WR X, AY 50 WR Y, AY 50WW, DR 250 SZ/SE/SF/SG
  • Yamaha: SA 50 M/ME

Product FAQs
Yuasa Battery Finder

As well as using our vehicle selector to find compatible batteries, you can also use the extensive Yuasa Battery Lookup tool at

Yuasa Battery Basics

View the Yuasa video guides on everything you need to know about your next Motorcycle battery:

  1. Battery Construction:
  2. How Batteries work:
  3. Selecting the correct battery:
  4. Battery charging:
  5. Battery installation:
  6. Battery Maintenance:
How do I charge my Yuasa battery?

Follow this simple Yuasa video on how to correctly charge your battery:

What does DC, CP, and WC mean?

Often abbreviated in the product name of batteries, e.g. "TTZ10S (CP)"

  • DC = Dry Charged (contains 1 battery, acid not included)
  • CP = Combipack (contains 1 battery and 1 acid pack)
  • WC = Wet Charged (contains 1 battery acid filled and charged)


Click & Collect Only

Select a collection point from our network of available dealers. You will be notified by the chosen dealer once your order is ready to collect, estimated time is 2-3 days (depending on national holidays and dealer opening hours).

  • Free for orders over £100
  • £11.95 fee for orders below £100



Standard Delivery

Orders will be despatched as follows: To business addresses only; £9.95 (Exc VAT) delivery charge (subject to change depending on account level); Free delivery with net order values of £100 and over (Exc VAT) to the UK Mainland; Orders to N. Ireland/Eire/Isle of Man/Scilly Isles by arrangement; other destinations phone for details; Typical delivery times of 1-2 working days.

Where possible, the Company will endeavour to meet special delivery requirements subject to any additional cost being borne by the Purchaser

Unfortunately, we do not delivery to addresses outside of mainland UK without prior agreement. Without prior agreement you may place an order for Products from outside the UK, but this order must be for delivery to an address in mainland UK unless arranged otherwise prior to your order.

Pallet Charges

Larger items may incur additional carriage charges, including but not limited to 4x4 and SUV tyres.


Read our full delivery policy here

Make Model Engine/Variant Year Notes
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1986 None
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1987 None
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1985 None
Suzuki AY 50 V - Katana 1997 None
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1982 None
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1983 None
Suzuki DR 250 SZ/SE/SF/SG - SJ41A 1984 None
Suzuki AY 50 WW - Katana 1998 None
Suzuki AY 50 WR X - Katana-Racing 1999 None
Suzuki AY 50 WR Y - Katana 2000 None
Suzuki AY 50 WR K1 - Katana 2001 None
Suzuki AY 50 WR K2 - Katana 2002 None
Suzuki AY 50 WR K3 - Katana 2003 None
Suzuki AY 50 WR K4 - Katana 2004 None
Suzuki AY 50 WR K5 - Katana-Ditech 2005 None
Suzuki AY 50 WR K6 - Katana-Ditech 2006 None
PGO Big Max 50 1995 None
PGO Big Max 50 1996 None
PGO Big Max 50 1994 None
Yamaha SA 50 M/ME - Passola 1980 None
Yamaha SA 50 M/ME - Passola 1981 None
Yamaha SA 50 M/ME - Passola 1982 None
Yamaha SA 50 M/ME - Passola 1983 None
Yamaha SA 50 M/ME - Passola 1984 None
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