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Ah, if it's Bosch, the battery is Samsung according to last training session I went to. Good quality stuff and their life cycles are very consistent with minimal deterioration.
Diagnostics is a store thing unlike Shimano. Essentially needs an encryption fob to get access to the program, which is magic for diagnosing issues. It was honestly far more than I imagined in terms of metrics and fault finding. Car level stuff.
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That's why i haven't modded mine to remove the speed restriction - i figure, even with the removable mods, it would be super easy to tell that i'd be using something and it would void the warranty.
My only frustration with the bike (which is so fun to ride) is the speed limit which i'm always hitting.
It's Bosch branded but I can see if it's sub branded anywhere...
Diagnostics are non-existent; the computer just shows battery charge level (5 pips), estimated range, mode and top speed.