Zündapp Alu City Green 3.0 Replacement Battery 36V 11600mAh

Zündapp Alu City Green 3.0 — 36V Li-ion Replacement Battery (SDI-3610C)

This 36V 11600mAh (417.6Wh) Li-ion battery is a direct replacement for the Zündapp Alu City Green 3.0 electric bicycle. It slots into the existing battery housing and connects to the bike's motor controller and BMS at the standard 36V rail. Capacity figures come from the product data, not estimated from third-party sources.

• Alu City Green 3.0 platform fit: The Alu City Green 3.0 runs a 36V motor controller with a specific connector pinout and BMS handshake tied to the SDI-3610C cell configuration. Swapping a non-matched pack can trigger a controller fault and disable pedal-assist entirely.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a 36V e-bike test rig. The BMS responded correctly to charge cutoff at 42V and engaged low-voltage protection at the expected threshold without false tripping under simulated pedal-assist load.
• Post-winter recommissioning: After any storage period longer than four weeks, charge this battery slowly on the lowest available charge rate before the first ride. Cold or deeply rested Li-ion cells carry higher internal resistance, and pushing full current through them before they warm up causes lithium plating on the anode — that damage is permanent and reduces total cycle life.

Why the Alu City Green 3.0 cuts out mid-hill on a new battery

Sustained climbing draws peak current from the pack for longer than flat riding. If the BMS detects cell voltage dropping below its protection threshold during that sustained draw, it cuts the output to protect the cells — killing pedal-assist mid-climb. A new but cold pack has higher internal resistance and sags faster under load, making this more likely on the first few rides. Letting the battery reach room temperature before a hilly route reduces the voltage sag at peak draw. After five to ten full charge cycles, internal resistance drops and the cutout behaviour typically stops.

Charger shows no activity after the Alu City Green 3.0 has been in storage

Li-ion packs that have sat unused for several months can discharge below the voltage threshold a standard charger uses to recognise a valid pack — typically around 30V on a 36V system. The charger sees a voltage it won't accept and stays dark or flashes an error. Connect the charger and leave it for 30 minutes without interrupting it. Most chargers carry a trickle pre-charge mode that slowly brings the pack up to the acceptance threshold before switching to normal charge current. If the charger still shows no activity after 45 minutes, measure the pack voltage at the output terminals — anything below 25V indicates cell damage that a trickle cycle will not recover.