LP-E6P Batteries

 The new Canon batteries LP-E6P for the Canon R5 Mark II are now in stock at various retailers, including Amazon.

The Canon LP-E6P battery, designed for the EOS R5 Mark II, is an upgraded version of the LP-E6NH battery used in previous Canon models. This new battery model supports higher power output to meet the demands of the R5 Mark II's advanced features. For instance, the LP-E6P is necessary to fully utilize high-resolution video modes like 8K and the high frame rate options (up to 240p in 1080p and various over sampled 4K options). Using older batteries, like the LP-E6NH, limits access to these intensive settings due to lower power output compatibility​ PetaPixel  Canon Forums

I should note that recent firmware updates have introduced support for the new LP-E6P battery in older Canon mirrorless cameras.