A leak published by androidheadlines provides reliable technical data on the upcoming Google Pixel Watch 4 for the first time – including a significantly improved battery life. The use of a more modern co-processor and increased battery capacity in particular should allow users to enjoy the smartwatch for longer.
Highlights
- 41 mm model: battery increases from 294 mAh to 325 mAh – runtime with always-on from 24 to 30 hours, power-saving mode from 36 to 48 hours
- 45 mm model: Battery increases from 420 mAh to 455 mAh – runtime in normal mode from 24 to 40 hours, in power-saving mode from 36 to 72 hours
- New ARM Cortex-M55 co-processor replaces older M33 – significantly more efficient and optimized for AI tasks
- Brighter AMOLED panel with now 3,000 nits (instead of 2,000 nits) for better readability outdoors
Battery: more capacity, noticeably longer runtimes
According to the leak, the 41 mm model has a 325 mAh battery, which corresponds to an increase of around 10 % compared to its predecessor. In the 45 mm case, the capacity increases to 455 mAh (+8%)
This leads to the following values:
- 41 mm: 30 h always-on, up to 48 h in power-saving mode
- 45 mm: 40 h always-on, up to an impressive 72 h in power-saving mode.
These values are significantly higher than those of the Pixel Watch 3, which only offered 24 h and 36 h respectively, regardless of size.
Energy efficiency: The Cortex-M55 takes over
The secret behind the improved runtime lies in the new ARM Cortex-M55 co-processor, which replaces the older M33. The M55 offers significantly more efficient DSP and ML support – according to Arm, up to five times more AI workload with lower energy consumption. This means that routine tasks such as heart rate measurement or AI-supported functions are increasingly performed on the co-processor in a power-saving manner.
Display & further specs
- Brightness: The AMOLED LTPO panel reaches up to 3,000 nits (previously 2,000 nits), which optimizes readability in bright sunlight.
- Memory & RAM: Consistent 2 GB RAM and 32 GB flash memory.
- Sensors: Heart rate, SpO2, ECG and UWB are back on board.
Conclusion
The leak suggests that the Pixel Watch 4 is primarily focused on increasing efficiency and runtime – rather than on dramatic hardware innovations. Thanks to larger batteries and the Cortex-M55 co-processor, the real usage time increases to up to 72 hours in power-saving mode on the 45 mm model, a real advantage in the wearable market. The bright 3,000-nit display rounds off the update. The official launch has been announced for August 20, 2025 at the “Made by Google” event. Price information is not yet available. As the RRP of the predecessor was between €400 and €450, we can expect similar prices here too.
