This device is easy to use and very effective for my intended uses of light brush and weed trimming along the flagstone pathways around my house. No problems with trimming weeds very close to flagstone surfaces. I have had no problems of any kind during moderately heavy use during the past few months of the weed and brush rapid growth season.
There appear to be conflicting instructions in the Owner's Manual regarding battery charging and storage. Page 8 says not to leave the trimmer plugged into the charger, and Page 10 says it is ideal to leave the battery connected to the charger.
P. 8 – Charging Procedure
This charger does not automatically turn off when the battery is fully charged. Please take care not to leave the grass shear + hedge trimmer plugged into the charger. Switch off or unplug the charger at the mains when charging is complete.
P. 10 - Storage
When the tool will not be used for several months, it is ideal to leave the battery connected to the charger.