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I have a GTS-4 which has served me well for a number of years. Recently, I now have problems getting it to switch on. When connected EITHER to the handle battery OR the 12v car battery adaptor (both of which are fully charged), the screen shows me "battery empty", which is clearly not the case.
Enough juice gets through to give me this permanent message. The screen works fine otherwise, beeping for a second and showing me the full panel, but then drops to the battery empty message.