Know what each component does
The battery stores energy. The controller manages delivery of electrical power to the motor using inputs from the supported sensors and controls. A display may show information and communicate settings, but it is not necessarily interchangeable with another display from the same brand. Pedal sensors, speed sensors, brake sensors and throttles vary in function and compatibility.
A battery management system supervises specified conditions within the pack. It does not make an unsupported charger or incorrect external wiring safe. Likewise, controller protection does not replace suitable cabling, retention and the protective devices specified by the manufacturer. These are layers in a designed system, not permission to improvise around one weak link.
Keep the documentation for the exact hardware revision. Kits can change connectors, firmware or communication protocols without a dramatic change in product name. Photograph labels and retain serial numbers where available. That record makes later troubleshooting and replacement sourcing much more reliable.
Read this as a map, not an installation diagram
- Energy source: the approved battery and its specified external interface.
- Power management: the matched controller and manufacturer-specified protective arrangement.
- Drive: the supported motor, including any required position-sensor connections.
- Control inputs: compatible pedal, speed and brake sensors, plus any legally permitted supported controls.
- User interface: the correct display and documented configuration.
The charger is a separate approved charging path, not a substitute power supply for testing the controller. This outline deliberately omits pin assignments, wire colours and connection order: those details must come from the actual manufacturer documentation, not a generic internet diagram.
Verify more than voltage
Confirm the supported battery voltage range, maximum charged voltage and current requirements. Check that the complete cable and connector arrangement is specified for the system. Matching nominal voltage does not prove that a battery can supply the required current or communicate with the controller.
Connector colour, shape and pin count are not reliable compatibility tests. A housing can be wired differently by different manufacturers. Do not join unknown leads, force keyed connectors or use an adapter whose pin mapping and ratings are undocumented. If polarity or a pin assignment is uncertain, stop and obtain qualified assistance.
There is no universal safe fuse value or wire size for every conversion. Protection depends on the design, current, cable characteristics and installation conditions. Use the specified devices and never replace a repeatedly operating protective device with a larger one merely to keep riding. Repeated trips indicate a fault or mismatch that needs investigation.
Route cables for movement and maintenance
With the system isolated according to its instructions, plan routing away from tyres, spokes, chains, brake rotors and sharp edges. Preserve enough slack for full steering movement without creating loops that can snag. Account for suspension movement where relevant and keep sensor wiring clear of moving cranks.
Secure the harness using the supported clips or restraints. Tightening a cable tie until it crushes insulation is not good strain relief. Avoid pulling on a wire to seat a connector, and do not leave a connector carrying the weight of a loose cable. Protect frame contact points using materials approved for the arrangement.
Keep connections accessible for inspection and follow the specified sealing method. Tape is not a universal waterproofing solution, and heat-shrink does not automatically make an unknown joint suitable. Do not pressure wash electrical areas. Moisture, corrosion or damaged seals call for inspection rather than simply drying the outside and continuing.
Make first power-up a controlled checkpoint
Before connecting the battery, complete the manual’s mechanical and electrical inspection. Ensure cables cannot contact moving parts and that the bicycle is stable. Follow the supplier’s specified start-up method, including any requirement for professional commissioning. Do not improvise live probing or bridge terminals to test whether a component is working.
Verify supported controls and safety functions exactly as instructed, including assistance cut-off and brake sensors where fitted or required. Unexpected motor movement, error codes, abnormal noise, hot connectors or a burning smell are reasons to stop and isolate the system safely. Do not defeat a brake interlock, speed sensor or thermal limit to clear a symptom.
Never open a lithium-ion pack or modify a mains charger using this guide. Bosch systems and other proprietary platforms may require authorised service tools; mixing them with unrelated conversion components is not a shortcut. Keep troubleshooting within documented user checks and refer unresolved faults to a competent technician.
Leave a useful record
Save the wiring diagram supplied with your kit, the component identifiers and a few clear photographs of the finished routing. Record any approved replacement parts. After early rides, inspect for cable movement, rub marks and connectors under strain. A tidy-looking installation is useful only when it remains protected in service.
When the system passes its documented checks, proceed to gradual braking and commute tests. Electrical readiness is one checkpoint, not a declaration that the complete bicycle is roadworthy.