** You should reinstall the watchapp from the settings activity if updating **
An extension to display your Pebble (with >2.0 firmware) current battery level in the excellent DashClock lock screen widget.
When adding the extension, make sure to open the preferences activity to install the companion watchapp.
Alternatively, directly open the link below in your Android browser if you encounter difficulties.
(NB: Pebble is only capable of reporting very coarse-grained battery estimates, in practice battery level may vary unexpectedly)
Source code at: https://github.com/garuma/pebble-battery-dashclock-extension
Watchapp direct link: https://neteril.org/pebble/companion_watchapp.pbw