The Canon R6 is weather-sealed and dust/moisture resistant, but it is not waterproof. It can handle light rain or mist, but should not be submerged or exposed to heavy downpours without a rain cover.
The R6 can experience heat limitations during extended 4K/60p recording. However, firmware updates have significantly improved thermal management, allowing for longer recording times and faster recovery compared to the launch version.
The Canon R6 uses the LP-E6NH battery. It is also backwards compatible with LP-E6N and LP-E6 batteries, though these older models may offer reduced battery life and slower continuous shooting speeds.
Yes, you can use Canon EF and EF-S lenses on the R6 using the EF-EOS R Mount Adapter. Performance is typically identical to or better than on native DSLRs due to the advanced AF system.