Alpina AGS 60 Li 3.7V Replacement Battery 2900mAh

My AGS 60 Li runs fine for a minute then suddenly cuts out completely — why does it keep doing this?

At 3.7V with a small Li-ion cell, the protection circuit cuts power the moment voltage sags below its threshold under load — this happens faster when the cell has aged or was stored discharged for a long time. The grass blade and shrub blade pull different loads, so if it cuts out more on one than the other, that confirms the cell can't hold voltage under peak draw. Charge the new battery fully before first use, and if the old one triggered this pattern repeatedly, the protection circuit may have logged stress that a new cell resets entirely. After fitting the replacement, run it on the lighter grass blade first to confirm stable voltage before switching to the shrub blade.

The trimmer feels weaker than it used to — the blades are moving slower even on a full charge

This is capacity fade presenting as torque loss: the cell still accepts a charge but its internal resistance has risen, so it delivers less current under load and the motor runs slower. At 3.7V this happens gradually and owners usually notice it on the shrub blade first because the 16cm blade demands more from the motor than the 8cm grass blade. It's not a motor fault — swap the battery and the speed comes back. If the replacement also runs slow, check that the blade attachment is fully seated and not creating drag before assuming an electrical fault.

Left my AGS 60 Li in the shed over winter and now it won't turn on at all — is the battery dead?

A 3.7V Li-ion cell stored in a cold shed through winter, especially if it wasn't fully charged before storage, very likely discharged below the recovery threshold — most protection circuits lock out permanently below around 2.5V and the tool won't respond at all. Plug the original battery into the charger and check whether any charge indicator activates; no response after 30 minutes means the cell is below recoverable voltage. A replacement cell doesn't carry that history, so it will power on immediately if the tool itself is undamaged. Before fitting the new battery, inspect the blade contacts and switch for corrosion from moisture in the shed.