I have just monitored a pack of the Yuntong 4300s (Matched from Demon) on my ProTrak.
At a constant 20A discharge, every cell remained above 1.2V until 620 seconds.
This compares with circa 500 seconds for a pack of EP4200s.
The overall duration (down to 1.0V per cell), is the longest I've seen of any pack, at 780 seconds.
Average discharge voltage throughout the first 300 seconds, is on a par with, (but not quite as high as) IB4200SVHs or EP4200 MII.
For the price, they are a steal!
Obviously I don't know about how long they will last, or how fragile they are, but they can't be as bad as last years IB4200s.
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