While we've already heard that the Galaxy Note 10+ will arrive with the largest ever battery on a Note series phone at 4300 mAh of actual capacity, the exact number is 4370 mAh, or about a 10% increase over the pack in the Note 9.
With the new second generation 7nm process for the Exynos 9825 or Snapdragon 855+ chipsets that will power it, the increase in battery power should bring on a welcome boost of the phone's battery life as well. The sources note that the new battery packs will be made in-house by Samsung SDI itself.
As for the two revamped Galaxy Watch Active 2 models that will be announced together with the Note 10 series, they will carry a 240mAh and 330mAh batteries, respectively, made by ATL (Amperex). That's an increase over the 230mAh piece in the basic Watch Active, and is reportedly made to accommodate the new ECG function that Samsung's fresh smartwatches will bring.