This lipo along with just about every 10S lipo these days is actually two 5S lipos. The short red & black wires have connectors on them which when connected form a series setup (10S). The two sets of balance tabs are for each individual 5S lipo. I end up lengthening the short red & black wires and operating them as two seperate packs and making my connectors on my Jive ESC a series setup.
As for how to use the 210 balancer, I'm not sure. I charge them using the two outputs on my charger, Hyperion Super Duo, in a sync charge. Try the Charger section on HF or RR if nobody gives you an answer here on balancing.