Buying a new Battery

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Hello,
my phone's battery is no longer useful and it doesn't last more than a couple of hours, so i've decided to buy a new one, i saw batteries with 1800mAh capacity, is it good? or i should just buy the original, and if any one know reliable brands i can buy from.

I bought a 1800mAh battery for my X1 and it works fine but I had to buy an external charger too because the phone charges only original batteries. So I suggest you to buy an original battery ;)
[edit]
I read this thread about batteries,it is very useful

http://forum.xda-developers.com/showthread.php?t=540054

I bought non-original battery(1650mAh) manufactured by Forever. Not sure about its actual capacity(I think it's around 1500), but after half a year it still works great. And original charger works with it too. And it cost me 1/5 the price of a original one. The only issue with it is not working temperature sensor.

my battery is 2 years old. it was not good one month ago. then I searched and found something about battery calibration on xda and now it is working well again.

before calibration ---> from 8 AM (100%) to 4 PM (30%) then power off or must charge ...
after calibration ---> from 8 AM (100%) to 8 AM (next day of course, %50)

I am a heavy user. xperia x1 is my primary phone. I talk 2-3 hours in a day and always connected to the internet over 3G (direct push from company mail and a hotmail account with synchronizing every 5 mins.)

the link is:

http://forum.xda-developers.com/show....php?t=1011099

I've bought a JinDian 1900mAh battery from eBay,it works like a charm!My phone works now 4-5 days without problems,i listen to music,talking~20mins