[HLUG] New Phone Battery wherefrom? (OT)

[George DiceGeorge]

Perhaps OT but I did ask last night for advice on where to get a new battery 
for my Samsung Galaxy S2.

Reviews of 
http://www.amazon.co.uk/Samsung-EB-F1A2GBUC-Galaxy-II-Battery/dp/B004WMGI94/ref=sr_1_2?ie=UTF8&qid=1411596163&sr=8-2&keywords=samsung+galaxy+s2+battery
say [I knew it looks 100% like the original but it does not work as the 
original one (it is just rubbish)!]

Samsung dont seem to sell one.

http://www.mobilefun.co.uk/official-samsung-galaxy-s2-standard-battery-eb-f1a2gbucstd-p29442.htm
is more expensive but can I trust them?

http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xsamsung+s2+battery&_nkw=samsung+s2+battery&_sacat=0
show lots but the reivews show that many are useless.

Is there a source that I can trust?

George