Simple, easy to use Astro Flight "Blinky" Li-poly balancer for A123 1-6 cell battery packs. Features: - Specifically designed for A123 batteries - See if all cells are above 2.8V before charging - Balance your pack while you are charging - Balance your pack after charging - Discharge individual cells that are overcharged - 0.100" pin spacing with 0.025 square pins - Direct fit for PolyQuest batteries More information (links): * Manual (.pdf)

Low Voltage Check - First connect the balancer to the A123 pack. Connect the most negative connection on the battery to the most negative pin on the balancer. If all cells are 2.8V or more all LEDs will turn on and remain lit for 5 seconds. If you have a three cell pack the first LEDs will turn on. If one cell is low and has less then 2.8V that LED will not turn on. This means that your battery pack has been discharged too far. DO NOT CHARGE FAST!! Set your charge rate between 0.1A and 0.2A and wait until the LEDs begin to blind again. This indicates that at least one cell has reached 2.8V or more. Disconnect balancer and then reconnect for another Low Voltage Test. Repeat as needed until all LEDs turn on for 5 seconds indicating that all cells have at least 2.8V. Then you can proceed to charge normally.

Balancing While Charging - Connect the balancer and wait for the low voltage check. If all cells show 2.8V you can proceed with a normal charge sequence. The LED lamps will remain off until one cell reaches a voltage of 3V, then balancing will begin. By the time the charge is complete the pack should be balanced. If the cells blink at random the pack is closely balanced. If a few LEDs remain on all the time these cells have a higher voltage then the other cells and more balancing is needed. When the charge is almost complete all the LEDs will turn on.

Balancing After Charging - Connect the balancer to the pack. The balancer will begin discharging every cell that has more than 3.6V. When all cells are 3.6V or less then the balancer will begin balancing to the lowest cell. When all LEDs turn off or occasionally blink at random, the pack is then balanced.

Note:
Red, Black, Black, and Black with no gaps or missing pins in the sequence.