25.2V Alpina 124563 Lawn Mower Replacement Battery 13800mAh

Alpina 124563 / AR 1 500 / AR2 Series — 25.2V Li-ion Replacement Battery

This 25.2V 13800mAh Li-ion battery replaces the original pack on Alpina cordless lawn mowers, including the 124563, AR 1 500, AR2 1200, and AR2 600. It delivers the full 25.2V rail these mowers expect, with a 347.76Wh capacity that matches the factory specification. Swap it in when the original pack no longer holds a charge or refuses to accept one.

• 124563, AR 1 500, AR2 1200, AR2 600 compatibility: These four models share the same 25.2V battery architecture, connector format, and BMS handshake protocol. One pack fits all four without adapters or firmware changes.
• Bench tested on actual hardware: We cycled this pack under simulated blade-motor load on the 25.2V platform. The BMS held protection thresholds correctly across charge, discharge, and inrush events — no spurious cutoffs on a warm, conditioned pack.
• Seasonal storage preparation: Before putting the mower away for winter, charge the pack to around 50–60% rather than full. A fully charged Li-ion pack sitting unused for months degrades faster at the cell level than one stored at mid-state.

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

When blade resistance spikes — dense clippings, wet turf, or a blade strike on a hidden object — the motor draws a sharp inrush current that can exceed the BMS protection threshold. The pack shuts down immediately to protect the cells, which looks identical to a dead battery. This is a protection event, not a fault. Let the mower sit for five minutes, then restart; the BMS resets automatically once temperature and voltage stabilise inside the pack.

Charger showing a fault light after the mower sat unused all winter

Over a long storage period, Li-ion cells self-discharge slowly. If they drop below roughly 2.5V per cell, most chargers read the pack as faulty and refuse to begin a charge cycle. This is a voltage-floor rejection, not a dead pack. Some Alpina chargers include a recovery or wake-up mode — hold the charge button for 10 seconds to trigger a low-current pre-charge pulse. If the charger lacks that feature, a compatible Li-ion recovery charger set to 25.2V at 0.5A will bring the cells back above the acceptance threshold.