Ekco T500

 This was a fairly rare battery charger because it supplied not only 2 volts but also 4 volts and 6 volts. After about 1928 some radios used valves with directly heated filaments which worked at higher voltages maybe to reduce the drain on an accumulator or maybe the newer filaments were longer lasting? By now the "dull emitter" was being introduced and this didn't get as hot as earlier types and were therefore much less stressed. Most battery set owners had to take their accumulator to the local cycle shop which oddly seemed the usual place set up for accumulator charging. With the trickle charger below one could charge ones own...

 

 

 

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