The 1100mah Capacity is designed to provide long battery life between recharges. The ego-T pass through 1100mah battery can be used as either a Passthrough or as a Regular Battery! Passthrough means you can plug it in to your computer or other usb power source and continue to use the device without wasting the battery power! So when you detach it from your power source you will have a charged battery.These batteries have a 5-button press safety feature. Just press the activation button 5 times quickly to disable the battery and keep it from firing unintentionally while stored. Press the button 5 more times and it will become active again.