Tenergy Intelligent 2.5A Charger for 18.5V 5S Li-ion/Li-Polymer Battery Pack Automatic change 5S 18.5V Li-Po/Li-ion battery from any status Patented 4 Stage charge algorithm guarantee 100% Protection Number of cells: 5 Li-ion / Li-Polymer cells in series Charge current: 2.5A  0.1A Dimension: 148mm x 78mm x 43mm