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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?
hippy-
I've the Goal Zero Flip 20. Works great, maybe the 10 version could be enough, but I could recharge the Edge 1000 at least 3 times before needing to re-charge the power-bank. Its not waterproof... I didn't care about that, they have the Venture 30 for that, but was too heavy for what I needed (just 1000km, not TCR/TransAm like you)
Yes the electrical switch is what I was thinking about, but didn't have time to do it myself before the 1000km brevet. Anyway at higher speeds there will be heatsink, but at least it won't get it when not being used. Heat wasn't a problem, I just were a bit careful before touching it.
Yes @acharnley I'll get the D1 fixed outside of the framebag (hopefully the new titanium model!), did it for the first 400km, but little rain came the first night and didn't care to get it fixed outside again for the rest of the ride. Both Garmin Edge 1000 and iPhone SE where complaining for Power Lost when riding at variable speeds, so I just wanted to do both things at the same time.... recharge power-bank and device.
bertocq
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.