The battery charges whenever the following conditions are met:

•The battery is not already fully charged
•The instrument is connected to a PC’s USB port and the PC is not in standby, or
•The instrument is connected to a USB charger.

Note:        In order to charge the instrument properly, use a USB charger that is either compliant with the USB charging specification (most commercial dedicated USB chargers), or the Apple charging specification (most Apple chargers that have a USB output). We do not recommend using the USB outputs of cell-phone chargers, as many do not follow either standard.

While charging, the charge LED is orange. When fully charged, the LED changes to green.

The charge time from a completely discharged state varies with the amount of power the PC allows the instrument to draw. Charge time is normally around 2H30. If the PC does not allow the fast charge current, the charge time can increase up to 5 to 6 hours.

Note:        When connected to a PC, battery charging stops while the PC is in standby.

Note:        It is OK to leave the instrument connected to a PC or USB charger all the time. The smart charger inside the instrument will stop charging as soon as the battery reaches full-charge.