Sunseeker LBF2025 20V Cordless Lawn Mower Compatible Battery 3400mAh

Sunseeker RMA1001M20V Series — 20V Li-ion Replacement Battery (LBF2025)

This is a 20V Li-ion replacement battery rated at 3400mAh (68Wh), using OEM part number LBF2025. It fits the Sunseeker RMA1001M20V, RMA301M20V, RMA501M20V, and RMA801M20V cordless lawn mowers. Same voltage rail, same connector, same BMS communication protocol across all four models.

• RMA Series compatibility: All four RMA models share the same 20V battery platform, connector pinout, and BMS handshake. The mower deck and drive motor specs differ across the range, but the battery slot, discharge profile, and communication lines are identical — one battery fits all four.
• Bench tested on actual hardware: We ran this pack through repeated blade-start cycles simulating thick-grass inrush current. The BMS held trip thresholds consistent with OEM spec and recovered cleanly after each high-draw pulse without locking out the pack.
• Seasonal storage tip: If the mower has sat unused since last season, check the pack voltage before charging. Cells that drop below 2.5V per cell over winter may not be accepted by the charger until a pre-charge recovery is attempted — most Sunseeker chargers show a fault light in this state. Charge indoors at room temperature before the first mow of the season.

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

The blade motor on the RMA series draws a sharp inrush current every time it bites into dense or wet grass. If that spike exceeds the BMS overcurrent threshold — which sits lower on a warm or partially discharged pack — the BMS cuts power to protect the cells. The mower stops mid-row, then restarts once the BMS resets. Keeping the blade sharp reduces the motor load and lowers the inrush current on each cut pass, which keeps the BMS from tripping in the first place.

Mower cuts out mid-row then recovers after a short pause

This is thermal protection activating, not a dead battery. The BMS monitors cell temperature and shuts discharge when internal temps exceed the safe threshold — typically around 60°C at the cell wall. It clears automatically once the pack cools. If this happens consistently, allow a 5-minute cooldown between battery cycles and avoid mowing in direct midday sun where the pack surface temperature is already elevated before the cut begins.