Which battery is the best for Olympus OM-D EM10?

[some_random_photography]

Hi,
Recently, I wanted to purchase a spare battery for my Olympus OM-D EM10. However, I realized that the official battery costed at least $50, which is not within my budget. Anyone can suggest any third party battery that they think is value for money?
Thanks!

 

[Blu-By-U]

That's a similar battery to the Stylus 1 that I still have. I use to be a miser and buy the compatibles like Wasabi, and so on. BUT I have found that those compatibles loose they charge very fast. It's great for the first year but then it starts to deteriorate and loose it's charge. In the long run, it's better to pay for the original. It's been more than 5 years now, the compatibles have long died. the 2 originals are still good.