Wiper i130S Replacement Battery 25.9V 5200mAh 075Z60900A

Wiper i130S / Climber / Q350 — 25.9V Li-ion Replacement Battery (075Z60900A)

This 25.9V 5200mAh Li-ion battery replaces OEM part 075Z60900A and 050Z38600A across the Wiper i130S, Climber, Q350, and Climber Q cordless mower range. It slots into the same battery bay and communicates with the same BMS logic as the original pack. Capacity is 5200mAh (134.68Wh) — matched to the product data, not estimated.

• Multi-model fit across the Wiper cordless range: The i130S, Climber, Q350, and Climber Q all share the same 25.9V battery platform, connector pinout, and BMS handshake protocol — that is why one part number covers multiple machines in this lineup.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles, monitoring BMS cutoff thresholds under simulated blade-motor inrush loads. The protection circuit responded correctly at both low-voltage and high-current limits.
• Seasonal storage tip: Before first use 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 has not warmed to room temperature.

BMS cutoff during thick-grass or wet-grass cutting

Thick or wet grass puts sustained high-current demand on the blade motor. If that draw spikes above the BMS overcurrent threshold — typically triggered in a single dense pass — the pack will shut off as a protection response. This is not a faulty battery; it is the circuit doing its job. Let the mower sit for 30 seconds, then resume with overlapping, lighter passes rather than pushing the full cutting width in one go.

Charger refusing to accept the pack after winter storage

A battery left discharged in a cold garage over winter can drop below the charger's minimum acceptance voltage — often around 20V for a 25.9V pack. Most Wiper chargers will flash a fault LED and refuse to begin a charge cycle in this state. To recover the pack, check the terminal voltage with a multimeter. If it reads above 18V, most chargers will eventually begin a trickle charge once the pack is at room temperature — leave it connected for 15 minutes before assuming the pack is dead.