You can check Apple Watch's battery on iPhone with Siri or a Battery widget. However, it's not a native feature to check iPhone's battery with the Apple Watch (as of today, iOS 15.5 + watchOS 8.6) Luckily, I've found a lightweight app called Battery Watcher that requires little setup to do just that. It's free and includes a live updating complication for the watch face. I demonstrate what the complication looks like in the video. It's very easy to read on a 40mm SE. Hopefully, this feature will come natively with iOS 16 and watchOS 9!
Download Battery Watcher here: https://apps.apple.com/us/app/battery...
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