Robomow Premium RS630 Compatible Battery 25.6V 6000mAh BAT6000A

Robomow Premium RS630 / RS635 Series — 25.6V LiFePO4 Replacement Battery (BAT6000A)

This 25.6V 6000mAh LiFePO4 battery replaces the original pack in the Robomow Premium RS630, RS635, RS635 Pro S, and TS1800 robotic mowers. LiFePO4 chemistry suits this application — it handles the blade motor's repeated inrush spikes better than standard Li-ion. Compatible OEM part numbers include BAT6000A, MRK6103A, BAT6000C, BAT6001B, MRK6105A, and 57953070.

• RS630 / RS635 / TS1800 platform fit: These models share the same 25.6V battery rail, connector pinout, and BMS handshake protocol. The same pack slots across all three without modification to wiring or dock contacts.
• Bench tested on actual hardware: We cycled this pack through simulated blade-load draws matching thick-grass cutting resistance. The BMS held voltage within spec across repeated motor-start inrush events and did not trigger a false cutoff during sustained high-draw passes.
• Spring startup tip: Before the first mow of the season, bring the battery indoors overnight if temperatures are below 10°C. Cold LiFePO4 cells carry higher internal resistance, and the blade motor's inrush current can trip the BMS on a pack that hasn't warmed to ambient.

BMS cutoff during thick-grass or wet-grass cutting passes

When the RS630 hits dense or waterlogged grass, the blade motor pulls a hard inrush current to maintain RPM. If the battery's state of charge is already low — typically below 20% — the BMS can read that spike as an overcurrent fault and cut the output rail entirely. The mower stops and the dock light shows a battery fault. Let the mower sit off the dock for 60 seconds, then reconnect — the BMS resets once the fault timer clears. Keep the battery above 25% when scheduling mowing sessions in overgrown conditions.

Charger not accepting the pack after winter garage storage

LiFePO4 cells self-discharge slowly but steadily over months. A pack stored uncharged through winter can drop below the charger's acceptance threshold — typically around 20V for this platform. The dock shows a solid fault LED and refuses to begin a charge cycle. To recover the pack, connect it to the charger and monitor voltage with a multimeter at the battery terminals. If voltage reads between 18V and 23V, leave the charger connected for 30–60 minutes — most Robomow docks include a trickle pre-charge mode that will bring the cells back above acceptance voltage before switching to full charge.