This one works really well, but you have to keep in mind a couple things. One, you must download and install the companion app from the Play Store called Gear Data Provider. It's a small app which is what will communicate phone battery info to the Gear device. Secondly, if you want to make sure the phone battery stays fairly current on your watchface, you will want to go into apps on your phone and make sure GDP app is not being optimized. Let it run in the background. It doesn't use much juice in my experience.
Not displaying phone battery is a limitation of Tizen OS, and devs don't want to go through the hassle of having to create a separate app for the phone. Facer has tons of free watchfaces that display phone battery as well. The companion app is built into facer for any watchface. You would also have to go into apps and make sure it's not being optimized either, if you want the battery info to stay updated routinely.
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