The YESA packs have a good reputation on the ES, John, so I reckon it should be fine.
I'm super impressed with my Ping 36V 10Ah pack; I haven't come close to finding out it's true range yet, but it's way over 20 miles on my Tongxin powered 'bent.
I rarely draw more than about 12A for short periods from the pack (the controller tops out at about 14.5A), my average current draw is pretty low, it fluctuates around the 2 to 4A zone for a lot of the time on the watt meter display, although I'm not quite sure how accurate the instantaneous current readings are. I'm guessing that I could ride for at least two hours on a charge, maybe three if the terrain was fairly flat.
I'd guess that the YESA packs are slightly better than the Ping packs, if only because they are more robustly constructed, with better connections.
My Ping pack has now been through about eight complete charge/discharge cycles and seems to be as good, or even slightly better, than it was when new. Straight off charge it sits at around 44V, but even after a weeks riding, with no charging, it still rests at around 39V (I only need to charge it about once every ten days.............). I've seen the voltage drop as low as 36V (!) when pulling about 14.5A from the pack on a sustained hill, but generally the pack voltage is around 38V or more when cruising along.
Jeremy
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