Gardena ComfortCut 7.4V Li-ion Replacement Battery 2500mAh

My Gardena ComfortCut was working fine last season and now it won't hold a charge after sitting in the garage all winter

Li-ion cells that sit discharged for months can drop below the recovery threshold — around 2.5V per cell — and most chargers won't attempt to charge a pack that reads that low. Plug the charger in and watch the LED: if it flashes briefly then stops, the pack voltage is likely too depleted for a standard charge cycle to begin. A replacement pack at full resting voltage (around 7.4V) will restart immediately on the same charger. Before writing off the charger, check that the contact pins on the battery housing aren't corroded from garage humidity — clean them with a dry cloth and retry once.

Replaced the battery in my ComfortCut 8893 and the blades are moving but cutting feels weak, like it's struggling through thick grass

A new 7.4V Li-ion pack should deliver consistent torque from the first cut — if the blades feel sluggish, the most likely cause is a dirty or partially blocked blade pivot, not the battery itself. On the ComfortCut series, grass pulp and fine debris pack into the cutting head and create mechanical drag that shows up most noticeably when the battery is fresh and you're actually pushing the tool harder. Remove the blade guard and clear the pivot channel before blaming the pack. If the issue persists, check that the battery is fully seated and the contacts are flush — a slightly misaligned pack on this form factor can cause intermittent voltage drop under load.

Gardena ComfortCut charger light goes green way too fast — battery feels warm and the tool still dies quickly

A charge cycle that completes suspiciously fast usually means the charger is detecting a full-voltage reading from a degraded cell group that has high internal resistance — it looks full but can't sustain load. At 7.4V nominal with Li-ion chemistry, a healthy pack should feel slightly warm after charging, not hot; hot suggests one cell is taking the majority of the charge while others lag. The 2500mAh rating on this pack gives you a clear benchmark — if the tool's run is noticeably shorter than it used to be on the same tasks, the cells have degraded past useful capacity. Swap to a new pack and note whether the charger now takes its full expected time to reach green — that confirms the old pack was the fault.