Battox Gelcells' are now available in game, and the Battox Gelcell Charger is also available (at certain stores). You can only use the charger in certain places (a cube or apartment), because it needs to be plugged in.
The gelcells are used in only one item at the moment (the medical bag, for resuscitation), but this will be expanded. The gelcells take time to charge, and will need to be left on the charger, though a signal will go off every once and awhile when the charge is complete.