I have a el-cheapo helmet that doesn't have batteries, just the solar panel). I bought it on Ebay about years ago and it still works.
I later bought a much nicer Miller helmet (wider viewport, lighter, more comfortable, adjustable delay settings, etc) which also has the solar panel, but also has two batteries. The helmet is indeed much nicer (and expensive to match) but the batteries don't last long. It seems the solar panel isn't really doing much since when the batteries go the auto-dark feature is very slow to respond.
Depending on how often you weld the HF helmet would probably work for you. I find myself welding more and more so the nicer helmet is worth the expense to me.
Here's a gate I built a couple of weekends ago:
