Recent content by tom foxe

The headlight on my Gazelle Ami is not very bright - 40 lumens. I'm quite capable of wiring a more powerful light, but does anyone know if the supply device - probably a DC-DC converter- can safely power a stronger light ? The Ami specs don't give enough info, and the electronics are probably...

5 months on, and the new battery failed and has been replaced under warranty by Rutland Cycles in Cambridge who have been very helpful. Today the motor failed to engage and the lights don't come on, though the head unit shows power levels selected. So the Kalkhoff record for me in 6 months is...

Thanks, they seem to have the right battery, will contact them tomorrow.

Thank you, much appreciated. So Impulse Evo refers to the motor. Have found a few of the right batteries on Ebay Germany but sadly they don't ship to Britain.

It isn't absolutely clear. I have the service manual with details of the original purchase & seller has written "Select Premium" model. However, on the bike frame it says Kalkhoff and Impulse Evo. But I have used the manufacturer part no. on the battery, which is labelled Derby Cycle, and...

Dear readers, I would welcome some helpful or well-informed responses. I wrote my piece to warn others, not because I expect to be given free spares for my bike. I have been buying used battery and other electrical appliances for decades, and most of them have been bargains. I understand that I...

We are in 2020. Buying a used ebike or even a new one but made several years ago that never had it's battery properly stored only asks for trouble !!

That's not my experience. All the batteries I've seen online that claim to be for a Kalkhoff Derby, my model, don't have the right connections to match those on my bike. I emailed BMZ who make the batteries for Kalkhoff (and are owned by Kalkhoff) and they said they only supply recognised...

I recently bought a 2017 Kalkhoff Derby. Which was great for one week. Then the battery failed, and the charger also seems to be faulty. Having been charged to 60%+, suddenly there are no lights on the charger or the battery pack. Kalkhoff dealers are bike mechanics, not electrical engineers. I...