Wow. I'm guessing the Echo attracts the type of owners who neglect their cars. I had a not-too-dissimilar experience with mine (my in-laws had bought it new).
I don't know about Bluetooth units, but I know my UltraGauge will have a slight draw. If it sits for more than a week (it constantly sits for weeks), I'd unhook it from your OBD port.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17
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