After initial issues the they stood by their battery.

I ordered a siker replacement battery for my early 2011 15" MBP. It came and worked great for about 6 weeks and then went totally dead. Luckily, the Siker people reached out for a review and when I told them of my issues promptly replaced the battery without any questions or issues. Fingers crossed that the new unit lives a long happy life. So far so good, but I will update my report if there are further issues.

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