80€ for Makita and 40€ for no-name brand. They've been tested and the 5Ah rating is accurate. What's remains to be seen is how these last long term.
Project Farm on the Tubez did a GREAT video testing heaps of knockoff batteries and counterfeits versus the official batteries! Unbranded knockoffs were significantly better than branded fakes. I have an unbranded knockoff battery for a vacuum and it ROCKS.