According to Macrumors, the 303.8 mAh battery is KTR certified and hardware-tested, with shape and capacity seemingly reserved for the future Apple Watch, with model number A2327.
For comparison, the current Apple Watch Series 5 has a 296 mAh battery, model number A2181 and identical appearance, while the Watch Series 4 has a 291.8 mAh battery.
The larger battery capacity of the new Apple Watch could result in a longer life than the previous generation. Of course, this also depends on the performance of the next generation of Apple smartwatches.
As claimed by Apple, the Watch Series 5 offers 18 hours of battery life. Since the battery is slightly larger, the Watch Series 6 is able to achieve significantly better battery life.
In addition, a report from DigiTimes has revealed that Apple may introduce a blood oxygen sensor with the Watch Series 6. With this feature, the Apple Watch Series 6 can notify the wearer when the oxygen data is in The blood is in danger.