Lawnbott LB75 25.2V Replacement Battery 9000mAh

Lawnbott LB75 / LB1200 / LB1500 Series — 25.2V Li-ion Replacement Battery

This is a 25.2V 9000mAh (226.8Wh) lithium-ion battery for the Lawnbott LB75, LB1200, LB1200 Spyder Ka, LB1500, and at least 17 additional Lawnbott robotic mower models. It slots into the same bay as the original pack and connects to the same 25.2V charging circuit. Check your mower's voltage label before ordering if your model is not listed above.

• LB75 / LB1200 / LB1500 platform fit: These models share a common 25.2V battery bay, connector pinout, and BMS handshake protocol. One pack covers the full range without wiring changes or adapter plates.
• Bench tested on actual hardware: We cycled this pack through simulated blade-motor inrush loads and confirmed the BMS held stable across repeated high-draw events. Cell voltage balance stayed within spec across all discharge stages.
• Seasonal storage care: Before storing the mower at end of season, run the pack to around 50% charge — not flat. A fully discharged Li-ion pack left over winter can drop below the BMS acceptance threshold, and the charger will refuse to initialise the pack come spring.

BMS cutoff on thick-grass and wet-grass blade load

Robotic mowers draw the highest current at blade motor startup and when cutting dense or wet grass. If the instantaneous current spike exceeds the BMS trip threshold, the pack shuts down as a protection measure — not a fault with the battery itself. This most commonly happens when the mower enters a patch of long or waterlogged grass after a dry run. Let the mower cool for five minutes, then resume; if trips are frequent, check that the blade disc is sharp and spinning freely, since a dragging blade multiplies inrush current significantly.

Charger shows fault light after mower sat in garage all winter

If the pack self-discharged below approximately 20V over winter, the charger's input detection circuit sees a cell voltage outside its acceptance window and refuses to begin a charge cycle. Place the pack indoors at room temperature for 12 hours first — cold raises internal resistance and makes the voltage reading worse than it actually is. If the charger still rejects it, use a compatible lithium recovery charger to pulse the pack up to around 22V, at which point the standard charger will accept it and resume normal CC/CV charging.