Ambrogio Nemh2o 25.2V 13000mAh Compatible Battery 045Z298000A

Ambrogio Nemh2o — 25.2V Li-ion Replacement Battery (045Z298000A)

This 25.2V 13000mAh (327.6Wh) lithium-ion battery replaces OEM part 045Z298000A in the Ambrogio Nemh2o robotic lawn mower. It fits the Nemh2o platform directly, matching the voltage rail and connector the mower's onboard electronics expect. When the original pack can no longer hold enough charge to complete a full mowing cycle, this replacement restores normal autonomous operation.

• Nemh2o platform fit: The Nemh2o uses a 25.2V 7-cell lithium architecture with a BMS that validates cell voltage before releasing power to the blade and drive motors. This replacement matches that voltage rail and communicates correctly with the mower's charge management circuit — no firmware or connector workaround needed.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench, including simulated blade-motor inrush loads. The BMS responded to overcurrent events correctly and reset without manual intervention after load was removed.
• Seasonal storage tip: Before the first mow of the season, bring this battery indoors overnight if air temperature is below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor's inrush current at startup can trip the BMS on a cold pack before the mower moves a metre.

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

The Nemh2o's blade motor draws significantly more current when cutting dense or wet grass — sometimes enough to cross the BMS overcurrent threshold. When that happens, the mower stops mid-row and the battery disconnects to protect the cells. This is the BMS working correctly, not a fault in the replacement pack. If cutouts happen repeatedly in heavy conditions, set the mower to a shorter cutting height or schedule jobs when grass is dry to keep motor draw below the trip point.

Charger showing a fault light after winter storage

Li-ion cells left in a garage over winter can self-discharge below the minimum acceptance voltage — typically around 2.5V per cell. Most chargers, including the Nemh2o OEM unit, will show a fault or refuse to initiate a charge cycle at that point. To recover the pack, apply a known-good Li-ion charger that supports a low-voltage recovery or "wake" mode, or connect the Nemh2o charger and wait up to 20 minutes — some chargers trickle at a low rate before switching to full charge once cells reach 3.0V per cell. If the charger still shows a fault after 20 minutes, cell voltage has likely dropped too far to recover safely.