In my 10 days of using the Apple Watch, the steps tracking seemed quite accurate. Days when I couldn’t reach my goal the watch also made me feel quite guilty about it. The Apple Watch also lets you measure your ECG, but it is a tricky process. You will need to measure your ECG using the app installed within the health app, which comes preinstalled with your iPhone. Battery This is one of the few areas where I feel the Apple Watch Series 7, First Copy Smartwatches could have been better in my opinion. With heart rate tracking and other notifications turned on, the Apple Watch Series 7 last me for one full day. This means, you will need to charge the smartwatch every single day.