Gardena Accu 100 Grass Shear 10.8V Li-ion Replacement Battery

My Gardena grass shears cut fine for a few passes then the blades just stop mid-job — battery still shows charged

This is thermal cutoff triggering before the battery is actually depleted. At 10.8V, the cells heat up faster when the blade is working through thick grass stems or slightly damp material, and the protection circuit shuts the tool down to prevent damage. Let the shears sit for 10 minutes with the blade guard off so heat can escape, then try again — if it restarts immediately, heat is your confirmed culprit, not the battery capacity. Keep the blade clean and sharp; a dull blade draws significantly more current and pushes the cells into cutoff sooner.

Replaced the battery on my Gardena Twin Cut and now the blades move slower than they did on the old pack — feels weak even on a full charge

A new Li-ion pack at 10.8V sometimes delivers lower output for the first several cycles because the cells haven't been conditioned through a full charge-discharge sequence yet. Run the shears until the tool slows noticeably and the battery is genuinely low, then do a full charge — repeat this three or four times before drawing any conclusions about performance. If the blades still feel sluggish after conditioning, check that the replacement pack is seating fully into the housing with a firm click; a partial connection increases internal resistance and drops the voltage under load. Put a multimeter across the battery contacts after a full charge — you want to see at least 12.4V at rest for a healthy 10.8V Li-ion pack.

Gardena grass shear battery charges fine but loses power sitting in the shed over winter — barely works by spring

Li-ion cells at this capacity self-discharge slowly over months, and if a 10.8V pack drops below roughly 9V in storage the protection circuit may lock the cells into a deep-discharge state that a standard charger won't recover from. We've seen this consistently with small-capacity garden tool packs stored fully depleted in cold conditions — the combination of low state-of-charge and low temperature accelerates the drop past the recovery threshold. Always store the pack at around 50–60% charge, not full and not empty, in a dry place above freezing. If the pack won't accept a charge next season, try connecting it to the charger for 30 minutes, disconnect, wait 10 minutes, then reconnect — this sometimes prompts the protection circuit to reset and allow a recovery charge.