Abstract: An automatic extraction device for extracting a liquid substance (e.g., oil) from plant material, is disclosed. The device comprising: an ethanol source, a mixing tank, in liquid connection with the ethanol source, comprising: an entrance for providing the plant material; a mixer, and an exit for extracting a mixture of the ethanol and the liquid substance, an evaporation system, in liquid connection to the mixing tank's exit, for evaporating the ethanol; and a condenser, for condensing the evaporated ethanol, the condenser. In some embodiments, the condenser may include: an entrance in gas connection with the evaporation system; a housing having a maximum external volume of at most 1 liter; and an internal array of heatsinks, located inside the housing, providing a surface-to-volume ratio of 4-0.5 [1/mm]; and a collecting tube, in liquid connection to the mixing tank, for collecting the condensed ethanol.

Abstract: A charger (100) for a portable battery powered device comprises a generally planar body (102). The body (102) comprises apertures (104a, 104b) for removably receiving and holding two batteries; contacts (110a, 110b) for engaging with terminals of each battery; a circuit (114) housed within the body (102) and coupled to at least a pair of the contacts (110b), the circuit (114) being configured to convert a voltage of the batteries into a predetermined charging voltage; and a connector (116) extending from the body (102) for providing the charging voltage to a said portable battery powered device. Major dimensions of the charger (100) are less than 86 mm by 54 mm and a thickness of the charger (100) is less than 5 mm.