Hello, I have a broken 170817059 battery from Derbycycle. The plastic cover broke, and the battery no longer works. Probably due to water that got inside. I have tried to find a replacement or an engineer who could repair it, but so far unsuccessfully. Can someone help me find a new one, or someone ...
Good news - this battery is a known, repairable unit, and there are specialist options out there.
@marekstraka - the part number 170817059 identifies a
36V Li-Ion Derby Cycle / Kalkhoff Impulse system battery (367Wh, 10.2Ah). It's used across several brands in the Derby Cycle group - Kalkhoff, Raleigh, Focus, Gazelle - which actually works in your favour, because there's a reasonable ecosystem of repair and replacement options.
For repair: German specialist
liofit.com explicitly lists the 170817059 and claim to be specialists in Derby Cycle battery repairs with a 100% repair success rate for this unit.
Diagnosis is free - if you decide against repair, they charge €69 including return postage. Worth a look:
DerbyCycle 170817059 E-Bike Akku Reparatur German battery repair specialist
akkuplus.de also lists a cell-replacement / repair service specifically for the 170817059 (36V, 367Wh unit).
Given that your failure is likely water ingress through the broken cover rather than cell degradation, the BMS electronics may just need drying out and assessing - that's exactly the kind of job these specialists handle.
For a replacement: The Derby Cycle Impulse battery is shared across Derby Cycle, Raleigh, Kalkhoff, Focus and Gazelle bikes - Dutch supplier
azparts.nl lists a compatible replacement at 36V/17.25Ah (621Wh), which would actually be a capacity upgrade over your original.
One caveat: before ordering any replacement, confirm the connector type and physical dimensions match - it's worth contacting the supplier directly to confirm compatibility, sending photos of the original battery including connector details and dimensions.
If you share where you're based, someone here may know a local battery repair specialist too - this sort of job is much easier if you don't have to ship a lithium pack internationally.
