1.has a rechargeable battery
The battery can be recharged and used over again.
2.operating power consumption
How much power the device consumes when it's switched on.
The device works longer without being charged.
4.has a battery level indicator
An indicator shows you when the device has low battery.
Battery power, also called battery capacity, represents the amount of electrical energy stored in the battery. Measured in milliampere-hours (mAh), it indicates how much electric power can be used over time. More battery power translates into longer battery life.
This feature conserves power when unit is not in use or recharging. It also shuts the machine down if it inadvertently gets trapped in a confined space.