Lizard M-V10 Replacement Battery 25.9V 7800mAh

Lizard M-V10 / Q6 / S2 / S4 — 25.9V Li-ion Replacement Battery (101-806)

This is a 25.9V, 7800mAh Li-ion replacement battery for the Lizard M-V10, Q6, S2, and S4 cordless lawn mowers. It replaces OEM part numbers 101-806, 1126-9105-01, and 1126-9138-01. Fit it when the original pack no longer holds enough charge to complete a full mowing session.

• M-V10, Q6, S2, and S4 compatibility: These four Lizard mower models share the same 25.9V battery platform, connector, and BMS handshake protocol. Swapping between models in this range is straightforward — the pack seats and communicates identically across all four.
• Bench tested on actual hardware: We ran this pack through the full charge-discharge cycle and verified BMS response under simulated blade-motor inrush loads. The protection circuit tripped correctly at threshold and recovered without fault on the charger.
• Cold-weather start tip: Before the first cut of the season, 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 can trip the BMS on a pack that hasn't warmed up.

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

The Lizard mower's blade motor draws a sharp current spike when it bites into dense or wet grass. If that spike exceeds the BMS overcurrent threshold — common in long or damp conditions — the pack shuts down mid-row as a protection measure. This is not a battery fault. The BMS has done its job. Let the pack rest for five minutes, then resume at a slower walking pace or make a second pass over the heavy sections rather than one slow grind-through.

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

Li-ion cells self-discharge slowly over months. If a pack sat in a cold garage from October to March, cell voltage can drop below the charger's acceptance threshold — typically around 20V on a 25.9V pack — and the charger refuses to begin a charge cycle. On most Lizard chargers, connect the pack and hold it plugged in for 10–15 minutes anyway; many units include a trickle-recovery mode that will pull the cells back above the acceptance floor before switching to normal charge. If the fault light clears within 20 minutes, the pack is recovering. If it stays solid red after 30 minutes, measure cell voltage at the pack terminals — below 18V means recovery has failed.