18V Gardena BLi-18 Hedge Trimmer Compatible Battery 2500mAh

My Gardena hedge trimmer starts cutting then suddenly stops mid-branch — is the battery dying or is something else going on?

That sudden mid-cut shutdown on the EasyCut Li-18/50 is almost always thermal cutoff, not a dead battery — the BLi-18 pack has built-in protection that trips when current spikes hard through dense or wet growth. The trimmer's motor draws significantly more under load than during light trimming, and a degraded or partially charged pack hits the cutoff threshold faster. Let the battery cool for 10 minutes away from the trimmer, then recharge fully before testing again on lighter growth. If it still cuts out on easy material, check the resting voltage of the pack with a multimeter — a healthy 18V lithium pack should read between 19V and 21V fully charged; anything below 18V at rest means the cells are failing.

New BLi-18 battery clicked in fine but the hedge trimmer runs slower than the old one did — blades feel like they're dragging even on thin shoots.

A new Li-ion pack sometimes ships in a partial state of charge after sitting in a warehouse, and the trimmer's electronics will throttle blade speed when voltage sags under load below a threshold. Fully charge the new pack before first use — even if it powered on — then run it through two full charge-discharge cycles on real hedge growth before judging performance. We also see this on the bench when a pack's internal resistance is elevated from cold storage, which mimics a weak cell under load even though the pack is technically full. If sluggishness persists after two cycles, check whether the gold contact tabs on the battery are seating cleanly against the trimmer's receiver — oxidation or debris on those contacts causes exactly this symptom.

My Gardena BLi-18 sat in the shed all winter and now the charger won't do anything with it — no lights, nothing.

Li-ion cells that self-discharge below roughly 2.5V per cell enter a deep-discharge protection state, and most standard chargers refuse to engage a pack in that condition. The BLi-18 pack has four cells in series, so if total pack voltage has dropped below around 10V over winter storage, the charger's safety circuit sees it as a fault and won't begin charging. Some Gardena chargers will attempt a slow recovery pulse — leave the pack connected to the charger for up to an hour before concluding it's dead, as recovery can be slow to initiate. Measure the pack voltage at the terminals with a multimeter: if you're reading anything above 10V, a recovery charge is likely possible; below that, the cells have been damaged by deep discharge and the pack needs replacing.