Laptop batteries L11119-855

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Paul_Tikkanen and Huffer helped me identify the battery I need for my laptop:

3-cell, 41 Whr  HP part # L11119-855  

I have been searching for suppliers in London. The prices range from £100 at HP to £29.  Some are authorized sellers by HP. I noticed that some batteries have a date on them. I imagine that the date on the battery in my laptop is close to the date when I bought the laptop. The installation charges in Tottenham Court Rd. London range from £50 to £150. 

- For optimal and long term performance my objective is to buy a battery with maximum life, not a used one.  I am sure that the date on the battery is important. What would be the optimal date? I noticed that the date is not a detail requested by sellers.

- What is the difference between batteries sold by HP and others that are compatible with them? Does HP replace batteries with some warranty?

Thank you in advance for your help.

[Huffer]

HP has batteries made to its standards by 3rd party manufacturers and allows them to place HP trademark on them. These are by definition reliable batteries. Other battery makers, including some of the same ones that make official HP batteries make "compatible" batteries. These are generally less expensive, but can be somewhat less reliable. If you buy on say Amazon.uk from a vendor with a high rating, you are safe. When I have to service an older laptop I do not hesitate to use "compatible" batteries and it is sometimes all that is available. HP stops directly selling replacement batteries at about the 2-3 year mark from when the laptop was made. Yours is older than that. I recognize the HP Part # for your battery and it is one of the most common replacement batteries. The "born on" date on the battery is important and perhaps perversely, the "compatible" ones tend to be fresher. "Official" batteries can be "new old stock". Batteries do deteriorate with age although it is not serious for maybe a couple years after manufacture and I have had 10 year old new old stock batteries that test very close to the capacity of a new one. Hope this helps. Battery warranty is one year in the USA; and it varies in other countries but yours is too old to be covered by any kind of warranty. 150 quid to replace a battery is highway robbery. 50 is much more like it but still very profitable for the tech. A good one can do it in 10 minutes. 

https://www.amazon.co.uk/L11119-855-Battery-Pavilion-L11421-421-HSTNN-LB8M/dp/B08S6P7Z21/ref=sr_1_4?...

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Many thanks to Huffer for his helpful reply.