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+===== Accumulator / battery operation =====
+In the early days of radio heaters and plate batteries were almost the only usable voltage source in the field; in military thus, this situation remained the same for years to rund the equipment independant from mains power sources.
+The old sets used accumulators for valve heating, usually high current and a voltage of 6.3 volts were used. Furthermore, the vlaves required different plate voltages, which could be delivered by anode or plate batteries, or care battery or mains operated converters.
+Poprtable military equipment of the sixties mostly used heater batteries (1.5 volts as standard) and anode or plate batteries (special format, usually 51 or 103 volts).
+The solid state sets from the seventies are battery operated and usually require standard battery types, with the exception of the widely used handheld Swiss "walkie-talkie" SE-125 which requires a 7.5 volt battery; after these special batteries were out of stock, an adapter for use with standard UM3 / AA batteries has been developed.