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Hi folks, Today I had a Haibike Hard Seven 2.0 with a Yamaha motor come in. Pressing the power button, display does not come on. Battery is fully charged. Up to now, I have done Bosch and Shimano training, also very comfortable with Bafang and other conversions, but not really had any...

I'm Dave Hinton, and I run a mobile bike repair & service business. Ive fitted conversion kits, serviced ebikes & am about to receive a Haibike to have a bit of fun with. Sometimes though I need a bit more technical advice - which is why I'm here!