Where to buy balancing taps?

nope still not with you. from how i have seen how the packs are made, you have, in the case of a max amps pack, 1 + wire and the rest terminate to the negative. this is to complete the circuit by switching between cells to monitor each cells voltage. but what happens when you plug a + wire tap with a negative connector? surel you will create a short... surely? unless i guess the hyperion charger senses polarity and detects a difference and then switches the circuit around? dunno, just bought some off all e rc and will wait and see. seems every man and his dog are out of them in the state. its prob right in front of me but i just dont see how it avoids a short.