I had a huge scare last year during a rainy outdoor shoot where my generic bank just gave up. Super stressful. Switching over to the SmallRig VB99 Mini V-Mount Battery 99Wh was the best move I made. Honestly, its been a total lifesaver. I am so satisfied with how it handles the a7 IV power draw without getting hot or cutting out mid-take. One unit basically lasts me a whole day of video and photos without needing a swap. Quick tips for your Seattle trip:

• Use a cable like the Anker 543 USB-C to USB-C Cable 100W to ensure it handles the PD power draw properly.
• Keep the battery in a small pouch if it gets really misty out there. The VB99 fits in your budget and usually ships fast from most big retailers. Its been solid for me and I havent had one complaint since switching.

Unfortunately, I have had issues with many expensive setups that were not as good as expected for the price. Quick clarification tho, are you mounting this to a cage or just pocketing it?

• K&F Concept 99Wh V-Mount Battery 14.8V 6700mAh provides professional capacity at a lower price point.
• Baseus Adaman 65W 20000mAh Power Bank delivers consistent PD on a budget. Professional gear is honestly often overpriced imo.

Jumping in here because I've had some really sketchy experiences with power banks overheating mid-shoot. You gotta be really careful with the a7 IV because it draws a lot of juice when recording 4K, and if the voltage drops even slightly, the camera just cuts. Honestly, for a wedding where you cant miss a moment, I would suggest staying away from the cheap stuff and going with something that has a dedicated PD output. Safety is the biggest thing for me so I usually stick to brands that have built-in thermal protection. Here are a few things I'd check:

• Make sure the bank supports at least 30W Power Delivery. If it's lower, the camera might drain faster than it charges.
• Use a high-quality cable like the Anker 765 USB-C to USB-C Cable 140W 6ft. A bad cable is usually why banks cut out because they cant handle the constant draw.
• Consider the Anker 737 Power Bank PowerCore 24K 140W because it has a screen that shows exactly how many watts are being pulled and the temperature. If you want to be extra safe, look into the Sony NPA-MQZ1K Multi Battery Adaptor Kit. It holds four NP-FZ100 batteries. It is way more reliable than a USB power bank because it uses the battery terminal, so you dont have to worry about the USB-C port getting loose or failing during a ceremony. Just be careful with dummy batteries from brands you've never heard of tho... I've seen them fry internal boards before.