12V Wolf Garten Robo Scooter Compatible Battery 2000mAh

My Robo Scooter 600 starts mowing then cuts out after a few passes — is the new battery faulty or is something else killing it?

With Ni-MH packs at this capacity, the most likely cause is a shallow-cycle history on the old battery that conditioned the mower's charging circuit to expect a partially dead pack — the new battery trips the low-voltage cutoff early because the threshold is now mismatched. Run two full discharge-and-charge cycles before assuming the battery is the problem. After the second cycle, check resting voltage at the pack terminals: it should sit above 13.2V fully charged on a healthy 10-cell Ni-MH stack. If it reads below 12.5V after a full charge, the charger is not completing the cycle correctly.

The charger finished but the Robo Scooter won't move at all — docking contacts look clean, what am I missing?

On robotic mowers in this class, the dock-side charging pins oxidize or bend slightly and make intermittent contact that the charger reads as a completed cycle when the battery barely received any charge. Pull the mower off the dock and measure voltage directly at the battery terminals — if it reads below 11V, the charge did not transfer despite the charger indicating done. Clean the mower-side contacts with a pencil eraser, reseat the battery connector firmly, and attempt a manual charge cycle if your dock supports it. A fresh Ni-MH pack at this voltage should accept charge within the first few minutes and show a measurable rise to at least 12V before the first hour is done.

Robo Scooter keeps returning to base really quickly after I put in the replacement battery — capacity seems way lower than the original

Ni-MH cells require several full cycles to reach rated capacity after sitting in storage, and replacement packs often ship in a partially discharged state that depresses early performance. The mower's battery management logic can also lock in a conservative runtime estimate based on the first discharge it observes, which compounds the problem. Let the mower run until it returns to base on its own three times in a row without interrupting it — each full cycle recalibrates the system's read of actual capacity. If performance hasn't normalised after four cycles, measure pack voltage under load: a healthy 12V Ni-MH pulling mower current should stay above 10.8V; a drop below that points to a weak cell in the pack.