The 550B is fully programmable allowing you to set charging parameters including charging time, current, charging end conditions, and more. The built-in balancer automatically detects and balances each cell voltage of the 2 to 5 cells in series. The 550B monitors the voltage of each cell during the charge process to equalize the peak voltage. With temperature sensor the 550B's processor monitors the temperature of the battery being charged. You can control maximum charging temperature to ensure a safe charging process. $79.99

Three working modes: 1. Charge and balance through balancing connector conversion board. 2. Charge directly to battery output lead, charge quick with no balancing. 3. Use both balancing connenctor and direct connect to battery output lead for charging and simultaneously balancing at higher amperage for larger capacity packs. Includes: # 1 pc - 550B Base Unit # 1 pc - Temperature Sensor and Connector # 1 pc - Input Power Lead - alligator clips to Power Supply Jack (6mm OD) # 1 pc - Output Power Lead - 4mm banana to alligator clips # 1 pc - CEH-8 Conversion Board Connector Wire # 1 pc - CCB-8QP with SMH Connectors Conversion Board.

Specs:

Input Voltage DC 10-18V, Input Current 6A, Output Voltage 21V (21.25V Max), Output Current 5A Max Output, Power 50W Max Dimension, 126 x 77 x 25 mm, Input Lead Power Supply Jack (6mm OD), Output Lead 4mm banana to alligator clips, Weight 300 g / 10.5 oz