Can not be full, but it is recommended to use fully charged, as described below:
1, the general vacuum cleaner can not be full of use, it doesn't matter. And Dyson vacuum cleaners are very well made. The quality is OK;
2, the charging vacuum cleaner is still recommended to be full, because the charging vacuum cleaner is not used for a long time, generally about 30 minutes, if not full, it may be out of power for a few minutes. Have not completed the cleaning task, there is no electricity to be flushed and used again;
3, nickel-metal hydride battery vacuum cleaner charging is using a special charger. The feature of this charger is that it can automatically adjust the charging current according to the battery temperature. When the battery is full, the charger will automatically stop charging. Therefore, the vacuum cleaner is always placed on the charger, which will not affect the battery life. However, it is not possible if you use a normal charger. When the battery is full, you should unplug the vacuum cleaner.