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Cache battery is needed to avoid the interruption of charge when speed varies too much, with a battery pack with pass-through I can charge any device, even when not moving, and recharge at the same time the battery pack when speed is enough to generate power.
Will the new titanium model have the same purpose for slow and medium speeds? I just did the 1000km brevet, and got again super-hot even with the battery-pack connected, maybe because what you said that there is a speed at which it just starts dissipating heat with or without something connected to the usb ports. But it still worked great and charged without problems.
bertocq-
The titanium model includes a feature to reduce the on/off cycling at lower speed. It will still turn the power off but there is a delay before it comes back on and only if the speed reaches a particular level for a period of time (hysteresis).
I take it this is a Garmin GPS with the annoying "Power Lost" warning? They were advised of this two years ago but never issued a fix. So easy to do as well.
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Which charge-through battery pack are you using? I had a look at Zendesk Zenpure whatever they were called but like my Anker batteries so got a larger one of them.
Maybe a switch inline with the D1 for faster riders?
acharnley
hippy
I'm now recommending fast roadies or competition racers place the D1 outside unless they have a device plugged in. Originally the D1 was designed for maximum efficiency at lower speeds, which is retained at higher speeds if a device is plugged in.
Touring cyclists rarely go above the speed at which the protection circuit kicks in (which is what generates the heat). Although the D1 can take the heat, it would be best to charge devices directly and to drop the cache battery (you'll also save some weight).