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I never came in those situations that I needed an extra battery, but for my next vacation I intend to shoot a lot of timelapse. Also I will be on the road with only my car, so very few occasions to reload the batteries.
If the results are satisfying, I will buy some extra original batteries, but for now I am looking for a cheap alternative.
By the way, the original D-LI90 says: Made in China.
@ Danielblues and Krazny: I heard about Patona, If I remember well, I once ordered something from them. Thanks for the link.