[Al Skierkiewicz]

Tom,
It is hard to know what the output of a battery charger could be. The 0.7 amp rating could be a "peak" rating based on a pulsed output. Since the switch does not present the same load as a battery would, the charger may have put out a really strange waveform. There are a few protection devices that could be in series with the power input on the switch that may have failed, and may be replaceable if a qualified person were to open the device. In most cases, I do not recommend the use of a charger as a power supply. It seems that many devices are designed for the lower voltage with the advent of lower voltage requirements for microprocessors. 3.3 volt interface electronics are becoming common as well, hence the move to 6 volt power inputs.