About this replacement
Wolf Garten GTA 700 / BA 700 Series — 18V Li-ion Replacement Battery (Li-ion Power Pack 5)
This 18V 2000mAh Li-ion battery replaces the original Li-ion Power Pack 5 and Power Pack 6 units used in Wolf Garten cordless garden tools. It fits the Trimmer GTA 700, BA 700, HTA 700, and PSA 700 series, among others. Capacity is 2000mAh (36Wh) — matched to the product data, not estimated from a third-party source.
- GTA 700 / BA 700 platform fit: These models share the same 18V rail, battery form factor, and BMS communication protocol. The connector pinout and latch geometry are consistent across the PSA 700 and HTA 700 series, so one battery type covers the full group.
- Bench tested on actual hardware: We ran this pack through a full charge-discharge cycle on a GTA 700 trimmer deck. The BMS held steady through motor-start inrush current and maintained the 18V rail without triggering overcurrent cutoff under sustained cutting load.
- Motor inrush conditioning on first use: On the first two cycles, run the trimmer at reduced throttle through light grass before tackling dense growth. This lets the BMS log actual inrush current spikes from the cutting head motor and set its overcurrent threshold accurately before you push the tool to full load.
BMS cutoff on trigger pull — why the GTA 700 shuts down at start
When a string trimmer motor starts, it draws a short but sharp inrush current spike — often three to five times the steady running current. On a degraded or deeply discharged pack, the BMS interprets this spike as an overcurrent fault and disconnects the cell immediately. The result looks like a dead battery even when the pack shows charge. A full charge to 20.8V before first use reduces internal resistance enough that the BMS threshold is not crossed during motor start.
Charger not recognising the pack after extended storage
Li-ion cells left unused for several months can self-discharge below the charger's minimum acceptance voltage — typically around 2.5V per cell. When the pack voltage falls below this floor, the charger refuses to begin a charge cycle and the LED stays solid red or shows no response. To recover the pack, use a charger that has a recovery or wake mode, or briefly connect a compatible charger and watch for the charge LED to flicker within 30 seconds. Once the pack climbs above the acceptance threshold — roughly 14–15V on an 18V pack — normal charging resumes automatically.