I'm using Gemini exclusively on my Gem, with a patched exagear to run a couple of x86 programs. You'll probably need a battery, but there are a couple of threads here about workaround replacements. I'm using a Huawei 2200mAh battery that gives enough juice to compute for 5-6 hours, but probably not enough to work as an all-day phone.
Given that Gemini provides both wifi and data, along with desktop-quality apps, it's my favorite handheld, even more than my PinePhone/kb.
Jake
