This is a simple balance board for up to 4S. Colour may be Blue or Red (or other) depending on stock.
This is NOT a charger board, this is NOT a protection board, the ONLY thing this board can do is attempt to balance a pack at the top of charge so that all the cells end up fully charged.
In short, when a monitored cell hits 4.2v a 62 ohm resistor is switched on in parallel with it causing the cell to slowly discharge (or charge less) until it his 4.19v.
The balance IC is Hycon 2215-BB3A (4 of).
Remember, this is NOT a protection device, balancing is about trying to equalise capacity of the cells, it is recommended that you have a protection as well to protect yourself against serious over-volt, under-volt and over-current situations.
If you are buying this, you already know what you are doing, or you shouldn't be playing with fire.
All of our products are shipped from Christchurch, New Zealand using CourierPost for NZ, and Airmail for international.