Cause:
1. The power have not been switched off after the machined have not been used for a long time, thereby, the electricity capacity was run out completely and the battery was destroyed.
2. The battery can not be uesd completely and reduce the working lift which caused by always have not been recharged fully
Solution:
1. Do switch off the power if long time nonuse. (If there is not power switch, try to fully recharge once time each week so to maintain well the battery.
2. When low battery, recharge fully so can make best used of battery.