Wolf Garten RL1000 Replacement Battery 24V 20000mAh

Wolf Garten RL1000 / RL2000 Series — 24V Sealed Lead Acid Replacement Battery

This is a 24V, 20000mAh (480Wh) sealed lead-acid replacement battery for the Wolf Garten RL1000, RL2000, RL500, RL550, and compatible robotic mower models. It slots into the battery bay and powers the drive motors, blade motor, and onboard navigation electronics. Capacity figures are taken directly from the product specification — not estimated.

• RL500 / RL550 / RL1000 / RL2000 compatibility: These models share the same 24V battery architecture, bay dimensions, and connector arrangement. The sealed lead-acid chemistry matches the original charge management circuit, so the onboard charger handles charge termination the same way it does with the factory pack.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles simulating blade motor inrush and drive load. The internal cells maintained stable voltage under combined motor draw, and the terminal voltage recovered correctly after each load spike.
• Winter storage — discharge floor matters on SLA: Sealed lead-acid batteries sulfate permanently if left in a discharged state through winter. Before parking the mower for the season, bring the battery to a full charge first. A deeply discharged SLA pack left for three or more months may not recover, even with a quality charger.

Charger showing fault after the mower sat in the garage all winter

Sealed lead-acid batteries self-discharge slowly over winter, and if the terminal voltage drops below roughly 20V, many automatic chargers will refuse to start a charge cycle — they read the pack as a short or a dead cell. This is a charger protection response, not a sign the battery is permanently damaged. Some chargers have a recovery or desulphation mode that applies a low-current pulse to bring the voltage back into the acceptance window. If yours does not, a bench charger set to manual mode can push the voltage above 20V, after which the automatic charger should accept the pack and continue normally.

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

This is thermal protection activating, not a faulty battery. When the blade motor works through thick or wet grass, current draw spikes well above normal running load. If the internal temperature of the pack climbs too high, the protection circuit disconnects the output to prevent cell damage. The mower goes quiet, sits for a few minutes, and then resumes once the pack cools. Keep the mowing zone clear of heavy clippings buildup, and if it happens repeatedly on the same patch, reduce the mowing boundary to let the mower handle smaller sections at a pass.