12.6V AC Charger for 10.8V and 11.1V Lithium-ion Batteries.
This AC 
charger is ideal for charging nominal voltage 10.8V or 11.1V lithium batteries that made with 3 cells in serial and 3 or 4 serials in parallel. such as 3S3P & 3S4P lithium-ion battery pack ( ( 3S4P means 3 
battery cells connected in serial, then 4 serials connected in parallel).
This AC charger works for BiXPower MP100 battery and other lithium-ion  batteries that accept 12.6V DC power 
input.

This AC charger output connector is 5.5x2.5mm:
Input: AC 100 ~ 240 V 50/60 Hz 
Output Voltage: DC 12.6V, 
Output Current: 3A  
 LED Red when battery is under charge. LED Green when battery is fully charged 
Connector: OD 5.5mm, ID 2.5mm
This battery has a LED indicator: when 
the power adapter output current > 300mA, the "Red" LED will light up, it 
means it is charging the battery. When the output current <= 300mA, the 
"Green" LED will light up, it means the battery is fully charged.
This AC charger is ideal for charging 3S4P lithium-ion battery pack (  ( 3S4P means 3 battery cells connected in serial, then 4 serials connected in parallel).