T420s UltraBay battery 57Y4536 (old) vs A 0, 36310 (new)

I want to buy UltraBay battery for mine t420s and these 2 options:

57Y4536 (old) Euro-105

http://www.Verkkokauppa.com/Fi/product/53279/crsbf

36310 A 0 (New) - 150 euros

http://www.Verkkokauppa.com/Fi/product/12878/dhfrs

The problem with the first battery cheaper on the referenced site above t420s is not listed as a laptop taken in charge. But when I check these:

http://shop.Lenovo.com/ISS_Static/WW/EMEA/merchandising/PDF/en/T420s_DS_EN.PDF

http://shop.Lenovo.com/us/sitelets/batteries

http://www.nbwn.com/products/20937/Notebook-Accessories/battery-power-supply/battery-Lenovo-IBM/Leno...

The first battery is clearly indicated for t420s.

I would be grateful if you help me to answer following questions:

1. is it more age compatible with t420s 57Y4536 ?

2 are there advantages of the new model on the old model? Is - this block?

I have defenetelly feel uncomfortable to pay 150 euros for the new model, if the old 105 Euro model works very well.

Both batteries are basically the same, the 57... We're older, without the authentication chip (does not work in T430s), the 0 a... one is more recent, with authentication chip (also works under T430s).

I use T420s with the 57Y4536. It's a Li - Pol battery. I bet that the new is also Li - Pol because Li - Pol is the only technology bringing cubic, not cylindrical, which is necessary for this battery.

Tags: ThinkPad Notebooks

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