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Ah, they really are old. I bet the connectors are worn or have corrosion on them. You can try isopropyl alcohol swabbing inside the connector. I also got some mileage out of my 800 when it got wet and the connectors oxidised, by scraping them with a fucking stabby thing, what do you call, a pin! Scrape the things with a pin and try the connector again.
705s. They used to work fine - done charging on the go on PBP, TCR, IndyPac, audaxes, etc. But they don't work any more. I've got three of the buggers so it seems like some systemic thing as it has happened on all of them at the same time, like Garmin has saboutaged the firmware to make luddites like me upgrade.