Wiper Blitz 25.2V Cordless Lawn Mower Replacement Battery 6900mAh

Wiper Blitz Series — 25.2V Li-ion Replacement Battery

This 25.2V 6900mAh lithium-ion battery replaces the original pack on the Wiper Blitz, Blitz 2.0, Blitz 2.0 Evolution L60, Blitz X, and over 34 additional Blitz variants. It slots into the same battery bay and connects to the same BMS handshake as the factory unit. Capacity is 6900mAh — 173.88Wh total.

• Blitz series compatibility: The Blitz lineup shares a common 25.2V battery platform and connector across its models. The BMS handshake protocol and cell configuration remain consistent across Blitz, Blitz 2.0, and the Evolution variants, so one pack services the full range without adapter or modification.
• Bench tested on actual hardware: We ran this pack through blade motor inrush loads replicating thick-grass cutting cycles. The BMS held steady at the high-draw start spike and did not trip on repeated load transitions. Cell balancing remained within spec across the full discharge curve.
• Seasonal storage prep: Before the first mow 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 on startup can trip the BMS on a cold pack before the cells have a chance to warm up.

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

The Blitz blade motor draws a sharp inrush current every time it engages dense or wet grass. If the BMS reads that spike as exceeding the safe discharge threshold, it cuts power to protect the cells. This is more likely when the pack is below 20% charge or when cells are cold. Top the pack above 50% before tackling heavy growth, and let the battery reach room temperature before use.

Charger showing fault light after the mower sat all winter

Lithium-ion packs self-discharge slowly in storage. After several months in a cold garage, cell voltage can drop below the charger's acceptance threshold — typically around 2.5V per cell — and the charger refuses to initiate a charge cycle. Most Blitz chargers include a recovery or "wake" mode: hold the charge button for five seconds or consult your charger label for the recovery sequence. If the charger accepts the pack and the voltage climbs above 3.0V per cell within the first ten minutes, the pack is recovering normally.