Bosch AGS 10.8V Hedge Trimmer Replacement Battery 2000mAh

My Bosch AGS hedge trimmer blade is moving but it's cutting really slowly and struggling through thin branches — is the battery the problem?

Most likely yes — at 10.8V, this pack is running close to its minimum discharge threshold, and a degraded cell will cause the trimmer to lose blade speed under load before it shows any low-battery indicator. Voltage sag under cutting load is the main culprit here: the pack drops enough mid-draw that the motor can't maintain torque, even though the tool appears to be running. Pull the battery off after a short cutting session and check the terminal voltage immediately — a healthy 10.8V Li-Ion should read above 11V at rest after light use, not below 10.5V. If it's sagging below that, the old pack's cells are exhausted and the replacement should restore normal blade speed within the first cut.

The AGS charger light goes green almost immediately when I put the old battery on — why does a "full" battery die after just a few cuts?

A green charge light that appears unusually fast means the charger detected a very low internal resistance and declared the pack full without actually restoring usable capacity — this is a classic sign of badly degraded Li-Ion cells that have lost most of their active material. The cells accept a surface charge quickly but can't sustain current under the real load of the cutting blade. This is different from a charger fault; the charger is working correctly, the cells are just worn out. Confirm it by checking terminal voltage right after the green light appears — if it's not sitting at or above 12.6V, the pack didn't actually reach a full charge state.

I left my Bosch AGS in the shed over winter and now it won't power on at all even after charging — is it completely dead?

Li-Ion packs left in deep discharge over a long storage period often fall below the minimum cell voltage that chargers will engage with — typically under 2.5V per cell — and the charger's protection circuit refuses to start a charge cycle at all. Some chargers will show a fault blink or simply do nothing rather than force-charging a pack at that level. We've seen this frequently with 10.8V packs that were stored partially discharged through cold months, as self-discharge plus temperature stress pushes them past the recovery threshold. If the charger shows no response at all after 30 minutes connected, the old pack is unrecoverable and a new cell-matched replacement is the only fix.