Collin Wogenstahlwrote a review of Petzl Reactik & Reactik + Accu Battery on July 12, 2018
Familiarity: I've put it through the wringer
Having an extra battery for my Reactik Plus headlamp has been great. The battery is really light and takes up next to no room in my pack. Although it takes about 4 hours to fully charge it seems to last for a good amount of time.