AL-KO GTLi 18V Trimmer Replacement Battery 1500mAh Li-ion

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

This is an 18V Li-ion replacement battery rated at 1500mAh (27Wh). It fits the AL-KO Trimmer GTLi 18V Comfort and the Rasentrimmer GTLi cordless string trimmer range. Same voltage, same connector footprint, same BMS handshake as the original pack.

• GTLi 18V Comfort and Rasentrimmer GTLi fit: Both models run the same 18V platform and share a common battery dock connector with identical cell count and BMS communication protocol — one battery pack covers both without adaptation.
• Bench tested on actual hardware: We ran this pack through motor-start inrush cycles on the GTLi cutting head. The BMS handled the trigger-pull current spike without tripping overcurrent protection, and cell voltage recovered cleanly between bursts.
• First-cycle load conditioning on the GTLi: On the first two uses, run the trimmer at a light cutting load — thin grass, short passes — before tackling thick or overgrown sections. This lets the BMS profile the motor's inrush draw and set accurate overcurrent thresholds before you push the head through dense material.

BMS overcurrent trip on trigger pull with the GTLi cutting head

When you squeeze the trigger on the GTLi, the brushed motor draws a short inrush spike before settling to running current. A new pack that hasn't profiled this spike yet may interpret it as a fault and cut output immediately. This is a BMS threshold issue, not a dead battery. Run two or three light-load cycles first, and the BMS recalibrates its overcurrent window to match the motor's actual start behaviour. After conditioning, the pack should hold through a full trigger pull without dropping out.

Charger not recognising the pack after it's been sitting unused

Li-ion cells self-discharge during storage. If the pack sits long enough, cell voltage drops below the threshold most chargers require to begin a charge cycle — typically around 2.5V per cell. The charger sees a voltage too low to safely accept and refuses to engage, often showing a blinking or absent indicator light. To recover the pack, some AL-KO chargers support a trickle or recovery mode — consult the charger manual for the recovery button or hold the charge button for five seconds to trigger low-voltage acceptance mode. If cell voltage has dropped below 2.0V per cell, recovery is unlikely.