Mowox BA 573 20V 3000mAh Replacement Battery RM 1000

Mowox RM 1000 WiU-SN Series — 20V Li-ion Replacement Battery (BA 573)

This is a 20V 3000mAh (60Wh) Li-ion replacement battery for the Mowox BA 573 part number. It fits the RM 1000 WiU-SN, RM 500 WIU-SN, RM 700 BTU-SN, and RM 900 WiU-SC cordless lawn mowers. Same voltage, same connector, same BMS handshake as the original pack.

• RM series mower compatibility: These four models share the same 20V battery platform, connector housing, and BMS communication protocol. One battery works across all of them — the charging circuit and cell configuration are identical across the range.
• Bench tested on actual hardware: We ran this pack through blade-start inrush and sustained cutting load cycles. The BMS held cutoff thresholds correctly, cell balancing activated at the expected charge state, and the charger handshake completed without fault codes on a standard Mowox dock.
• Cold-weather start precaution: If temperatures are below 10°C, bring the battery indoors overnight before mowing. Cold Li-ion cells have higher internal resistance, and the blade motor's inrush current on startup can trip the BMS on a pack that hasn't reached room temperature.

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

When the blade hits dense or wet grass, motor inrush current spikes sharply — often two to three times the steady-state draw. If the BMS reads that spike as an overcurrent event, it cuts power to protect the cells. This trips more often on a warm day when the motor is already running hot. The fix is to slow down the mowing pass through heavy sections, giving the motor time to maintain speed rather than forcing it to surge repeatedly.

Charger rejecting the pack after winter storage

Li-ion packs left uncharged over winter can self-discharge below the charger's acceptance threshold — typically around 2.5V per cell. The Mowox charger runs a voltage check before initiating the charge cycle, and a pack below that floor gets flagged as a fault. To recover the pack, try leaving it on the charger for 30 minutes regardless of the fault indicator — some chargers will trickle-charge a low pack back into the acceptance window. If the charger still shows a fault after an hour, the pack has discharged too far for recovery and needs replacing.