About this replacement
AL-KO 38.4LI / DC-3630LI Series — 36V Li-ion Replacement Battery (91132807)
This is a 36V Li-ion replacement battery for AL-KO cordless lawn mowers, rated at 3000mAh (108Wh). It fits the 38.4LI, DC-3630LI, Comfort 38.4 Li, and over 80 compatible AL-KO mower models. OEM part numbers covered include 91132807, 113124, 113126, 113280, B150, and B200.
- 38.4LI and DC-3630LI platform fit: These models share the same 36V battery rail, connector pinout, and BMS handshake protocol. One pack covers the full range without any adapter or firmware mismatch.
- Bench tested on actual hardware: We ran this pack through a full charge-discharge cycle on the AL-KO platform and monitored BMS response under simulated blade-motor inrush. Cell voltages balanced correctly and the protection circuit responded within spec on over-current events.
- Seasonal storage tip: If the mower has sat unused since autumn, bring the battery indoors overnight before the first spring use. Cells below 10°C carry higher internal resistance, and the blade motor's inrush current on a cold pack can trip the BMS before the blades reach full speed.
BMS cutoff on thick grass and wet-lawn blade load
The AL-KO 38.4LI blade motor draws a sharp inrush current every time it bites into dense or wet grass. If the battery's state of charge is already low, the BMS reads that spike as an over-current event and shuts the pack down to protect the cells. This is normal protection behaviour, not a battery fault. Let the pack cool for five minutes, then resume on a lighter row to confirm the BMS resets cleanly.
Charger won't accept the pack after winter storage
Li-ion cells left in a garage over winter can self-discharge below the charger's acceptance threshold — typically around 2.5V per cell. When the pack voltage is too low, the charger reads it as a fault and refuses to start a charge cycle. Some AL-KO chargers include a recovery or "wake-up" mode — connect the pack and hold the charge button for 5–10 seconds to initiate a low-current pre-charge. If the charger begins the cycle, allow it to complete fully before using the mower.