Rollme Vast: Smartwatch that can run up to 200 days without charging

Chinese company Rollme has introduced the Rollme Vast, possibly the most long-lasting smartwatch on the market right now. The device’s standout feature is its 1000 mAh battery, which can deliver up to 200 days of standby time. This was reported by GizmoChina.

How such long battery life was achieved

In normal use—when the watch continuously measures heart rate and blood oxygen levels—the Vast can run for about 40 days. That is already a strong result for wearable devices with a color display.

The record 200-day endurance is achieved in a “watch + notifications” mode, where health sensors and bright backlighting are rarely used.

The large battery capacity works together with an energy-efficient 1.83-inch IPS display and optimized software. The watch does not attempt to be an all-in-one device like flagship models: it lacks LTE, built-in GPS, or an AMOLED screen with Always-On display. Instead, it focuses on multi-month battery life.

What the watch can do

Health monitoring is handled by the HX3918 optical sensor, which tracks in real time:

• heart rate, with alerts if it exceeds safe levels
• blood oxygen saturation (SpO₂)
• sleep quality and sleep stages

The watch supports more than 70 sports modes with automatic activity recognition—running, cycling, rowing, rock climbing, and more.

After workouts, the watch generates a detailed report including:

• training duration
• distance covered
• heart rate zones
• calories burned

Additional features include a voice AI assistant that can control alarms, reminders, calendars, and music playback from a connected smartphone.

Connectivity is handled via Bluetooth 5.4, providing stable connections and low energy consumption.

The device is also protected against water and dust with an IP68 rating, meaning it can survive immersion up to 1.5 meters for 30 minutes.

Price and availability

The Rollme Vast is already on sale in two colors: black and silver. Its price is only $30.

For that cost, buyers get a very long-lasting wearable with basic health and fitness tracking features, without unnecessary power-hungry extras.

For people tired of charging their smartwatch every 3–7 days, this could be a particularly appealing option—especially if battery life is the top priority, rather than ultra-bright displays or advanced smart features.

In brief

The Rollme Vast smartwatch features a 1000 mAh battery and record battery life of up to 200 days in standby (about 40 days with active heart rate and SpO₂ monitoring). It offers a 1.83-inch IPS display, 70+ sports modes, the HX3918 sensor, a voice AI assistant, IP68 protection, and Bluetooth 5.4 connectivity.

The watch costs $30, comes in black and silver, and is already available for purchase.