The average time for the BATTERYBOKS 2 to be fully charged and ready to use is 3.5 hours. Basically, you connect the BATTERYBOKS 2 to the CHARGER 2, by inserting the battery cord (BATTERY DC PLUG) to the charger cord (CHARGER DC PLUG).
When charging, the LED of the CHARGER 2 will turn red.
When fully charged, the LED of the CHARGER 2 will turn green.
When charging, the LEDs on the BATTERYBOKS 2 will blink.
When fully charged, the LEDs on the BATTERYBOKS 2 will stop blinking and eventually shut-off.
Keep in mind it is possible to charge the BATTERYBOKS 2, with the CHARGER 1, and BATTERYBOKS 1, with the CHARGER 2. However we do always recommend using compatible products.