I am new to the R/C community, and am trying to be safe with these batteries. Here's my questions, I have been using the charger supplied with the Q 500 4k and it's been working fine. But it takes too long to charge my 3 batteries ( planning to get more as budget allows) so I purchased an ultra power up120ac duo. It seems that I need to get two ec3 cables. Why dose the Yuneec charge with just the balance cable, but the U/P charger needs me to attach the ec3 also? Is there anyone else using one of these?