This is the new 2.7 Power Plus 110v AC Charger. It works with 2.5 and 2.7 Power Plus, Power Plus or prior batteries and gives you the benefit of balanced charging and the timer to reduce the risk of overcharging and provide balanced charging.
Use it to charge your second set of batteries.
Only use this charger with the 2.5 or 2.7 batteries or Power Plus batteries. The 2.7 charger has a red plug and the 2.5 batteries have a red ring around the dial. (The 3.5 Power Plus charger has the blue plug.) To upgrade the charger too, please see the combo below.
Warning on chargers!! Do not use 110v chargers with convertors to other voltages. Most likely, either the charger or the converter will be damaged. If you are travelling in Europe, take the 230v Charger with you instead.