Haibike Sduro 36V 13000mAh Replacement Battery

Haibike Sduro / FullNine Series — 36V Li-ion Replacement Battery

This is a 36V 13000mAh (468Wh) lithium-ion battery for the Haibike Sduro and FullNine series electric bikes. It replaces the original frame-mounted pack that powers the pedal-assist motor system. Fits the Sduro, FullNine RC, FullNine RX, HardNine RC, and five additional models in the same platform family.

• Sduro and FullNine platform compatibility: These models share the same 36V battery bay geometry, connector pinout, and BMS communication protocol — which is why a single pack covers the full range. Swapping between them requires no adapters or wiring changes.
• Bench tested on actual hardware: We cycled this pack through repeated motor-start loads and sustained climb simulations. The BMS handled peak current draw without tripping into protection mode, and cell balance held tight across the full discharge curve.
• First ride after storage: If the bike has sat unused over winter, connect the charger for at least two hours before taking the bike out. Cold Li-ion cells carry higher internal resistance, and pushing the motor hard on a cold, partially charged pack accelerates capacity fade at the anode level.

E-bike motor cutting out mid-hill on a new battery

On steep inclines, the motor draws sustained high current that can spike beyond the BMS protection threshold — even on a fully charged pack. When that happens, the BMS cuts power to protect the cells, and the motor goes silent mid-climb. This is more common on first use because the cells haven't been through a full conditioning cycle yet. Running two or three complete charge-discharge cycles normalises cell resistance and raises the effective cutoff ceiling so the BMS trips less readily under climbing load.

Charger not accepting the pack after long-term storage

Li-ion packs left uncharged for months can drop below the minimum acceptance voltage that most chargers require to begin a charge cycle. The charger sees the pack as a fault condition and refuses to start. Connect the charger anyway and leave it plugged in for 30 minutes — most chargers will trickle current into the pack until the cell voltage climbs back above the threshold, typically around 30V, at which point normal charging resumes automatically.