Systeminfo binding reporting incorrect value for battery/remainingCapacity

I am using the Systeminfo binding to monitor some aspects of my OpenHAB server (running Ubuntu 16.04), amongst others the remaining capacity of the battery (it is a laptop).

It seems to work well, except that apparently the “remainingCapacity” channel of the “battery” group is reporting an incorrect value.

With a fully charged battery (reporting a 100% charge by the “upower” command) I get 117% remaining capacity from the Systeminfo binding. Anybody else noticing this?