Huawei WATCH 2 Faq page 3

Disconnect & reset to restore the watch to factory settings.
(2) If the watch has previously been paired with a phone, reset the watch to factory
settings and then pair with the new phone. If you are using an iPhone, you need to unpair
the watch from the phone before performing a factory reset. Go to Settings > Bluetooth
on your phone, then touch the info icon next to the watch's Bluetooth name and touch
Forget this Device. After this, turn Bluetooth off and then on again on the phone, exit and
restart the Android Wear app, and then re-pair the watch with the phone.
4:How do I improve the usage time of my watch?
Solution:
(1).It is recommended that you uninstall or refrain from using certain power-intensive
third-party apps.
In the Android Wear app, touch the Settings icon to open the settings screen. Under
Device settings, select the connected HUAWEI WATCH 2, and then touch Watch battery
to check detailed battery statistics.
Under Settings > APPs, choose the power-intensive third-party apps, and then click
Uninstall or Disable.
Tip: third-party apps can enhance the functionality of the watch, but some third-party
apps also increase power consumption. Take care when downloading and installing third-
party apps.
(2).Use the watch's Smart power saving mode