AL-KO Trimmer GTLi 18V Replacement Battery 2000mAh Li-ion

AL-KO Trimmer GTLi 18V Comfort — 18V Li-ion Replacement Battery

This 18V 2000mAh (36Wh) Li-ion battery fits the AL-KO Trimmer GTLi 18V Comfort and Rasentrimmer GTLi cordless string trimmers. It slots into the same battery bay as the original and communicates with the onboard BMS. Voltage and connector match the AL-KO 18V platform directly.

• GTLi 18V Comfort and Rasentrimmer GTLi platform: Both trimmers share the same 18V battery bay, slide-lock connector, and BMS handshake protocol. One battery covers both models without any modification.
• Bench tested on actual hardware: We ran this pack through repeated motor-start inrush cycles on the GTLi cutting head. The BMS handled the trigger-pull spike without tripping overcurrent protection, and cell voltages stayed balanced across discharge.
• Motor inrush conditioning on first use: Run the trimmer at half throttle for the first two cycles before pushing through dense grass or thick edge growth. This lets the BMS log the motor's inrush current profile and set accurate overcurrent thresholds before heavy-load operation.

BMS cutoff on GTLi trigger-pull inrush surge

When you pull the trigger on the GTLi, the brushless motor draws a short inrush spike that can be several times higher than steady-state cutting current. A new pack fresh from storage sometimes has a BMS that hasn't yet profiled this device's inrush pattern. If the BMS reads that spike as an overcurrent fault, it cuts the output rail immediately. Running two half-load conditioning cycles trains the BMS to distinguish normal motor start from a real fault, eliminating nuisance cutoffs at trigger pull.

Charger not recognising pack after storage

Li-ion cells that have sat in storage can drop below the charger's acceptance voltage threshold — typically around 2.5V per cell. When that happens, most AL-KO chargers either blink an error or show no response at all. Place the battery in the charger and leave it for 10–15 minutes without interruption; many chargers will trickle-charge at low current until the cells recover to the acceptance floor. If the charger still won't engage after 20 minutes, check each cell group with a multimeter — any cell group reading below 2.0V indicates a recovery issue that the charger cannot resolve on its own.