About this replacement
Gardena AccuCut Li Lawn Shear — 18V Li-ion Replacement Battery
This is an 18V 3000mAh (54Wh) Li-ion replacement battery for the Gardena AccuCut Li series of cordless lawn shears and grass shears. It fits the AccuCut Li 400, AccuCut Li 450, and related models that share Gardena's 18V battery platform. Voltage and capacity match the original spec exactly — no adapter, no modification required.
- AccuCut Li series compatibility: These models share the same 18V voltage rail, battery housing geometry, and connector pinout — one battery spans the full lineup without fitment issues.
- Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage steady under cutting load and tripped the low-voltage cutoff cleanly without hard shutoff or cell damage.
- First charge on Li-ion grass shears: Run a full charge before first use, then let the tool run until the low-battery indicator triggers — this helps the BMS calibrate its state-of-charge window accurately.
Why capacity matters on a high-cycle trimming tool
Lawn shears like the AccuCut Li make short, repeated cuts — the motor draws current in frequent bursts rather than a single sustained load. A 3000mAh cell bank handles that burst-and-recover pattern better than lower-capacity packs, which can sag under repeated draw spikes. The 54Wh rating reflects actual usable energy, not peak cell spec.
Battery not recognized by the charger — here's why
If the Gardena charger shows an error light with a new battery, the BMS may have entered deep-sleep protection during storage. Connect the battery to the charger and leave it for 10–15 minutes without interrupting the cycle. The charger's trickle stage will wake the BMS and full charging will resume. Removing and reinserting too quickly resets the handshake and extends the delay.