Top essential accessories for a new Canon mirrorless camera setup?

In my experience, moving from a DSLR to the Canon R system is a huge jump, but honestly, you're gonna feel that battery drain almost immediately. I've been shooting for over fifteen years and the biggest lesson I learned is that mirrorless cameras are basically tiny computers with screens that never turn off... well, mostly. Here is what I recommend for your new setup:

• 1. High-quality power. Do not cheap out here. I tried some generic ones years ago and they literally just died at 30 percent... so annoying. You definitely want the Canon LP-E6NH Lithium-Ion Battery because it supports the higher burst rates and in-camera charging. Also, grab a PD-rated power bank like the Anker 737 Power Bank 24000mAh 140W for those long days. If it doesnt have Power Delivery, it basically wont charge while youre using the camera.
• 2. Fast storage. You asked about UHS-II and yeah, its totally worth it. Even if youre not a pro, the buffer clears so much faster, which stops the camera from locking up after a burst. I personally use the SanDisk 128GB Extreme PRO SDXC UHS-II Memory Card and it handles 4K video and high-speed stills without breaking a sweat. Your old cards will work, but youll feel the lag, i promise.
• 3. Sensor protection. Since there is no mirror box, the sensor is literally right there when you change glass. A solid blower is non-negotiable. I always keep a Giottos AA1900 Rocket Air Blaster Large in my bag to puff away dust before it sticks. Anyway, I hope that helps you out. Mirrorless is awesome once you get the hang of it!! cheers

TL;DR: consensus is power and speed.

• Nitecore UCN2 Pro Dual Slot USB Charger
• Standard units

Unfortunately, standards lack 800mA output... definately go Nitecore for reliability. gl!

Stumbled upon this discussion today and oh man, I went through this exact same transition last year. Honestly, moving from my trusty DSLR to the mirrorless world was exciting but also kinda frustrating because I tried to cut corners on the budget. My biggest mistake was buying a cheap knock-off adapter. It felt loose and the autofocus was acting weird, so I eventually had to spend more to get the Canon Control Ring Mount Adapter EF-EOS R. The extra dial is actually super helpful for changing ISO on the fly. Regarding the battery drain, I unfortunately had issues with those cheap generic ones everyone recommends; they literally just stopped communicating with my camera mid-shoot. I finally just stuck with the official Canon LP-E6NH Rechargeable Lithium-Ion Battery. It's pricey but it actually lasts and charges via USB-C which is a lifesaver. For protection and value, here is what I suggest:

• Vello Screen Protector Glass for Canon EOS R6 to keep that big screen from getting scratched up.
• SanDisk 128GB Extreme PRO SDXC UHS-I Card 200MB/s if you wanna save money over the UHS-II versions; it's honestly fast enough for most hobbyist stuff.
• Peak Design Slide Lite Camera Strap SLL-BK-3 because these bodies are smaller and the weight distribution feels way different than a chunky DSLR. Basically, my lesson was that trying to save $20 on generic power or adapters just isnt worth the headache. Stick to the quality stuff where it matters! Good luck with the new kit! Peace.

• SmallRig Camera Cage for Canon EOS R
• VSGO Camera Sensor Cleaning Swabs
• Think Tank Photo Emergency Rain Cover

Respectfully, I'd consider another approach. Fast cards arent vital, but gear safety is key. Safety first tho!!

Theo is totally right about the charging specs, its really all about that handshake between the power source and the camera. Most people dont realize that Canons internal charging circuit is super picky about specific Power Delivery (PD) profiles. If you dont have a source that supports the right voltage and amperage (usually looking for 9V at 3A for those mirrorless bodies), the camera simply wont pull a charge. I've messed around with some DIY external power setups using buck converters and dummy batteries for long timelapse work, and the voltage regulation has to be precise or the camera just errors out. I'm curious tho, are you planning on doing more long-form video or just strictly stills? Also, do you already have any high-wattage USB-C laptop chargers or power banks that support PD 3.0? Knowing your current tech stack might save you from buying stuff you dont actually need.

I get it, the battery drain is real. Watch out for cheap generic batteries cuz they can literally just DIE mid-shoot - it's super annoying. Here's what I recommend:

• extra batteries (u rly need like 3)
• a UHS-II card for faster buffer
• a rocket blower for the sensor

Honestly I'm so happy with the switch... did u find the adapter easy to use? extra batteries definitely fixed it for me!