Wolf Garten R10Ac Replacement Battery 25.2V 6900mAh

Wolf Garten R10Ac / R30Ac / R50Ac — 25.2V Li-ion Replacement Battery

This 25.2V Li-ion pack at 6900mAh (173.88Wh) replaces the original battery in the Wolf Garten R10Ac, R10D, R30Ac, and R50Ac cordless lawn mowers. It slots into the same battery bay and communicates with the mower's onboard BMS using the same cell voltage profile. Voltage and connector match the OEM specification.

• R10Ac, R10D, R30Ac, R50Ac compatibility: These four mower models share the same 25.2V battery platform and connector pinout. The cutting deck motor on each draws current through the same BMS handshake protocol, so one cell configuration covers all four variants.
• Bench tested on actual hardware: We ran this pack under simulated blade-load cycles to verify BMS cutoff thresholds and cell balancing behaviour. The protection circuit responded correctly at both high-draw start surge and sustained cutting load without nuisance trips.
• Seasonal storage tip: Before storing the mower over winter, discharge the pack to around 50–60% charge — not flat, not full. Storing a Li-ion pack at full charge for several months accelerates cell degradation faster than normal use will.

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

The blade motor on the R10Ac series draws a sharp inrush current every time it hits dense or wet grass. If the pack's cells are partially depleted or cold, internal resistance rises and the BMS may read that spike as an overcurrent fault and cut power. This is a protection response, not a faulty battery. Let the pack rest for five minutes, then resume mowing at a slightly faster walking pace to reduce dwell time per blade rotation.

Charger refusing to accept the pack after winter storage

Li-ion cells left in a garage over winter can self-discharge below the charger's minimum acceptance voltage — typically around 2.5V per cell. When that threshold is crossed, most Wolf Garten chargers show a fault light and refuse to begin a charge cycle. Bring the pack indoors at room temperature for several hours first — some chargers will then detect the slightly recovered cell voltage and enter a recovery charge mode. If the charger accepts the pack at 25–26V resting voltage, the cycle has completed correctly.