Wolf Garten R.S.400 Compatible Battery 25.6V 3000mAh

Wolf Garten R.S.400 / Loopo M2000 — 25.6V Li-ion Replacement Battery (WG-MRK7005A-ET)

This is a 25.6V, 3000mAh (76.8Wh) Li-ion replacement battery for the Wolf Garten R.S.400, R.S.600, Loopo M2000, and Loopo M2000 Typ: 22CCFAEA650 robotic lawn mowers. It replaces OEM part numbers WG-MRK7005A-ET and BAT7000C. Fit this when the original pack no longer holds a charge or the mower fails to complete a scheduled cutting cycle.

• R.S.400 / R.S.600 / Loopo M2000 platform fit: These models share the same 25.6V battery rail, physical housing, and BMS communication protocol. One pack covers the full group — no adapter or firmware workaround needed.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a Wolf Garten compatible BMS rig. The protection circuit responded correctly to over-discharge cutoff and the cell balancing held within spec across five cycles.
• Spring recommissioning tip: Before first use of the season, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor inrush current on a cold pack can trip the BMS before the mower leaves the dock.

BMS cutoff during thick-grass or wet-grass cutting passes

The blade motor on the R.S.400 draws a brief inrush surge each time it bites into dense or damp grass. If the battery's state of charge is below roughly 20%, the BMS reads the voltage sag from that inrush as a fault condition and cuts output to protect the cells. The mower stops mid-row, returns to the dock, and reports a battery or motor error. Running the first few cuts on a freshly charged pack — above 24V resting — prevents most of these nuisance trips.

Charger shows fault light after mower sat unused all winter

Li-ion cells self-discharge at roughly 2–3% per month in storage. After a full winter, a pack stored without a top-up charge can drop below the charger's acceptance threshold — typically around 20V for 25.6V chemistry. The charger sees a voltage it treats as a damaged or deeply discharged cell and refuses to start a charge cycle. Some Wolf Garten chargers support a recovery or wake mode — consult the charger manual for the activation sequence, then watch for the charge LED to switch from fault to active within two minutes. If the pack doesn't respond, check resting voltage with a multimeter; anything above 18V is usually recoverable.