How long does the battery last on a charge?

It uses an 11.1V three-cell battery charged over USB-C. Runtime depends on what you blend; thick mixtures and hard ingredients drain it faster, so expect several small blends per charge rather than a full day of heavy use.

Can it really grind coffee beans and grate cheese?

Beast lists coffee grinding, cheese grating and vegetable mincing among its uses. These are small-batch jobs; results are best in modest amounts, and very hard ingredients put more strain on the motor and battery.

Is it a replacement for a full-size blender?

No. It is a cordless personal blender for single servings and small prep tasks. For large batches, hot liquids or frequent daily blending, a corded full-size blender is more capable.

How does it compare with other cordless blenders?

Its 11.1V three-cell battery gives it more power than many basic USB portable blenders, which is why it handles dips and purées. The trade-off is weight and recharge time.