DHGate is hit and miss for me. Mostly miss. Try to get it from a supplier that has a website and a physical address. Not just a virtual existence on a retail platform such a AliExpress. Although AliExpress is a good option. Search for the R009-80 battery dorado 52V. Look for the best cells inside the battery housing and not generic. Having local support would be nice with Google Maps reviews. These reviewers are required to be actual humans with Google Accounts. I saw an online only eBike seller's site recently that had 60 five-star reviews and no reviews under five-stars. This, when you cannot get 60 Texans to agree on BBQ sauce, is unlikely.