Stiga SBT 2580AE 80V Cordless Mower Compatible Battery 4000mAh

Stiga Combi 43 AE / Combi 48 AE — 80V Li-ion Replacement Battery (SBT 2580AE)

This is an 80V lithium-ion replacement battery rated at 4000mAh (320Wh), built to fit the Stiga Combi 43 AE, Combi 43 S AE, Combi 48 AE, Combi 50 S AE, and over a dozen additional models in the Stiga AE cordless mower range. It slots into the same battery bay as the original SBT 2580AE, SBT 4080 AE, and SBT 5080 AE packs. The BMS communicates with the mower's motor controller at the same handshake voltage as the factory unit.

• AE platform compatibility: The Combi 43 AE, 43 S AE, 48 AE, and 50 S AE share the same 80V battery rail and connector pinout. The BMS on each model expects the same cell voltage thresholds and state-of-charge signal — this pack meets those requirements without modification.
• Bench tested on actual hardware: We ran this pack on a Combi 43 AE under simulated blade load. The BMS held its cutoff threshold correctly during inrush, delivered consistent voltage through discharge, and triggered low-cell protection at the expected floor voltage without nuisance tripping.
• First use of the season: Before your first spring cut, 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 at startup can trip the BMS on a pack that hasn't warmed to room temperature.

BMS cutoff under thick grass and wet-lawn blade load

The Stiga AE mower draws its heaviest current at the moment the blade engages dense or wet grass. That inrush spike can briefly exceed what the BMS permits if the cells are cold or partially discharged. The BMS reads this as an over-current event and shuts the pack down to protect the cells. Starting with a fully charged, room-temperature pack significantly reduces the chance of a nuisance trip in heavy cutting conditions.

Charger showing a fault light after the mower sat all winter

Li-ion cells self-discharge slowly over months of garage storage. If the pack drops below roughly 2.5V per cell, most chargers refuse to begin a charge cycle — the fault LED is the charger rejecting a pack it reads as critically under-voltage. Some Stiga chargers include a recovery mode: remove the pack, wait 60 seconds, reinsert it, and watch for the charge LED to switch from fault to charging. If the fault persists after two attempts, the cells have dropped too far for safe recovery and the pack needs replacing.