For most skiers and snowboarders, non-heated gloves are completely sufficient. They rely on your body heat trapped by insulation—whether that's synthetic fill or down—to keep your hands warm, and they do the job well when you choose the right combination of insulation and fit. You'll also save a significant amount of money and avoid the hassle of charging batteries every night.
The key is making sure your non-heated gloves match your typical conditions. If you ski in bitter cold or tend to run cold-handed, look for higher insulation ratings, mittens instead of gloves (mittens are warmer since fingers share heat), and a snug but not tight fit that doesn't restrict circulation. A waterproof-breathable membrane is also essential to keep insulation effective.
Heated gloves become worth considering if you have poor circulation, medical conditions like Raynaud's, or regularly ski in extreme cold for long days. But for the majority of resort riders, a well-chosen non-heated glove with proper layering underneath is all you need.