Since we're talking batteries! I just received a pair of SMC 2s 60c 9000mah bigguns. I asked for
XT90's as well and they delivered.
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I wanted a set of longer running 4s power so the Nero wouldn't be as nutty as it is on 6s. I haven't run these yet as it's dark and they're still charging.
They fit perfectly width and height wise, and are about an inch longer than the default Onyx 5400's.
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And just in case anyone had doubts, SMC does test each of their batteries:
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I'll post back after I give these a full run!