Last year Anatel nailed the battery capacities of the Galaxy S9 and S9+. It has published its certifications for the Galaxy S10 batteries too, but something feels off. It lists all three models - EB-BG970ABU, EB-BG973ABU and EB-BG975ABU - which correspond to the Galaxy S10 Lite, S10 and S10+. However, all three are listed as 3,000mAh. That lines up with what we've heard about the S10 Lite, which was rumored to have a 3,100mAh battery (the 100mAh difference comes from the distinction between minimal and typical capacity). But the middle Galaxy S10 was supposed to have a 3,500mAh...
Source: https://www.gsmarena.com/brazils_anatel_lists_batteries_for_all_three_galaxy_s10_models_as_3000mah-news-35220.php