Lawnbott Lb75 Replacement Battery 25.2V 10200mAh Li-ion

Lawnbott Lb75 / Lb1200 Series — 25.2V Li-ion Replacement Battery

This 25.2V, 10200mAh (257.04Wh) lithium-ion battery fits the Lawnbott Lb75, Lb1200, Lb1200 Spyder Ka, Lb1500, and at least 17 additional Lawnbott robotic mower models. It is a direct cell replacement for units where the original pack no longer holds a charge through a full mowing cycle. Voltage and connector match the OEM specification across the listed platform.

• Cross-model compatibility on the Lawnbott platform: The Lb75 through Lb1500 series share a common 25.2V power rail and the same BMS handshake protocol. That is why a single pack services the full range — the BMS communicates with the dock charger the same way across all listed units.
• Bench tested on actual hardware: We ran this pack through charge-discharge cycles on a Lb1200-class mower dock. The BMS balanced cells correctly across the 6S configuration, and cutoff thresholds for both over-current and low-voltage tripped at expected values with no latching faults.
• Seasonal storage prep for robotic mower batteries: Before parking the mower for winter, charge the pack to approximately 60% — not full. A fully charged Li-ion pack sitting unused for months accelerates capacity loss. Most Lawnbott docks will reach this level if you interrupt a charge cycle manually at roughly 15V on the pack terminals.

BMS cutoff during thick-grass or wet-grass blade load

The blade motor on the Lb-series draws a sharp inrush current every time it hits dense or wet grass. A new or cold pack has slightly higher internal resistance, and that inrush can push instantaneous current draw past the BMS over-current threshold. The BMS trips as a protection measure — it is not a fault in the battery. Let the mower rest for five minutes, then resume. After the first five to eight charge cycles, cell internal resistance drops and nuisance trips become rare.

Charger shows fault light after mower sat idle all winter

Robotic mower batteries left on the dock — or off it — through winter can discharge below the charger's acceptance voltage threshold, typically around 20V for a 25.2V pack. The dock charger sees the pack as a damaged cell group and refuses to begin a charge cycle. Use a bench charger or a compatible Li-ion charger with a recovery or "wake-up" mode to push the pack back above 22V. Once the pack voltage clears that threshold, the standard dock charger will accept it and complete a normal charge.