This unit charges 3.0V / 3.6V batteries fine and it has auto-off feature to prevent battery being over-charged. Batteries are fully charged in about 1 to 2 hours.

Features:

• Charge both 3.0V & 3.6V batteries
• Auto-off when batteries are fully charged (1 to 2 hours)
• Independent charging channels
• Charge one or two batteries at a time
• 110/220V auto switch AC power
• Depth: 2.68"
• Height: 1.18"
• Width: 2.76"
• Weight: 4.46 oz (with power cord)

Warning:

• Before plugging in the included AC cord, be sure to set the correct battery voltage (3.0 / 3.6) via the switch on the side.
• Do not mix and charge 3.0V and 3.6V batteries simultaneously.