No, that is not necessary. The package claims it: Ready to use, and that is correct. This means you can use the Eneloop batteries right out of the package. Just keep in mind that Eneloops do not come fully charged from the factory. They are charged about 70% when leaving the factory, and before they are in your hands.
I did a test with a brand new (old stock) but 10-year-old Eneloops, and the batteries still held a 60% charge. So only if you want to use their full capacity you should charge them before using them.
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