What batteries do you have? You probably only need one of those.
In practice LiPos don't drift out of balance in normal use, so you don't really need a balance lead. It's worth checking their balance regularly with a meter to make sure they're okay, but if you don't abuse them they'll stay in balance fine.
One advantage of a balance lead is you're checking the balance every time you connect it, but if you get a bad connection you can actually put it out of balance...
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