Agro R800Li 25.2V Replacement Battery 2300mAh Li-ion

Agro R800Li — 25.2V Li-ion Replacement Battery

This 25.2V, 2300mAh (57.96Wh) lithium-ion battery replaces the original pack in the Agro R800Li cordless lawn mower. It fits the R800Li directly and restores the mower to full cordless operation. Voltage and cell configuration match the original battery management system requirements.

• R800Li platform fit: The R800Li runs a 25.2V Li-ion architecture — six cells in series. This replacement matches that cell count, connector type, and BMS communication protocol. Swapping to a different voltage pack would trigger a protection fault immediately on startup.
• Bench tested on actual hardware: We cycled this pack through simulated blade-load draws reflecting thick residential grass conditions. The BMS held cutoff thresholds correctly and recovered charge acceptance within normal parameters after full discharge cycles.
• First spring use tip: Before starting the mower after winter storage, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor's inrush current on a cold pack can trigger the BMS overcurrent protection before the mower completes a single pass.

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

The R800Li blade motor draws significantly more current cutting wet or overgrown grass than dry, short turf. When that inrush current spikes past the BMS overcurrent threshold — typically within the first two seconds of blade engagement — the pack shuts down as a protection response. This is not a battery fault. Letting the mower deck clear the blockage, waiting 30 seconds, then restarting allows the BMS to reset. Consistent cutouts in heavy grass indicate blade load is exceeding what a 2300mAh pack at 25.2V can sustain continuously — slower mowing pace reduces draw.

Charger not accepting the pack after winter storage

Li-ion cells left in storage self-discharge slowly. If the pack dropped below approximately 2.5V per cell over winter, most chargers will display a fault light and refuse to charge — this is a low-voltage lockout, not a dead battery. Some chargers include a recovery or wake mode that applies a low trickle charge to bring cells back above the acceptance threshold. If the charger shows a fault, check the manual for a recovery cycle option. Without one, a compatible charger with a soft-start function can typically recover the pack if cell voltage has not fallen below 2.0V per cell.