This is a 7S 2A Active Balancer for Lithium Batteries, commonly used for balancing voltage between lithium battery packs to extend their lifespan.
The board features a capacitive energy transfer mechanism with up to a 2A equalizing current, which helps achieve efficient balancing.
It is compatible with various battery types including Li-ion, LiFePO4, and LTO, often marketed under various DIY brand labels.