Contacted Supower regarding the following Price Quotes and Shipping Quotes below - Trusted? Maybe. Expensive? Definitely:
I wrote Supower that I am very interested in the Samsung 25R 2.5ah 20ah discharge p/cell for higher continuous amp discharge rides on hills, etc and liked the overall specs. (I also asked about 20R for reference but since they aren't much cheaper than 25R and would require more cells to equal the same 10AH that I use, I still am planning to go with the 25R but got the quote regardless for 20R too as well as the Panasonic cells they initially recommended until they realized it wouldn't work to meet my requirements after all, see below)
Want to pull 30-35amps for continuous hill riding so at 2.5ah per cell decided to go for at least 4p so I have 10ah or the ability to go up to 80a discharge (at 20a p/cell or 8c max) but at 3c continuous it's more like 30amps (7.5a max p/cell at 3c x 5p = 37.5a discharge) to safely ride longer on hills or applications that draw about 30-35a without overheating or lowering the overall lifecycle. I would never ride at 10c ever but 3c seems reasonable and even if I do a 5 min moderate hill ride I will most likely average very few overall minutes on anything other than light hills and flat sprints for most practical purposes but I want the ability to easily do moderate hills without worrying ever.)
My mini scooter runs great at 12s (44.4v nominal/50.4v max) so I was planning to chose either:
12s4p or 12s5p with a 3a charger and a 45a max rated BMS all from Supower including spot welding the tabs, wiring all up to the bms which is shrink wrapped inside.
This is the response from Supower:
They said:
"Yes, 20R / 25R could do 20A (8c) max continuing for one single cell, so the 12S4P pack could do 80A continuing, 12S5P could do 100A continuing at 20a/8c discharge."
"Here is the quotation for your reference:
44.4V 10Ah 12S4P (25R) $340.00
44.4V 12.5Ah 12S5P (25R) $395.00
44.4V 10Ah 12S5P (20R) $345.00
50.4V 4A Lithium Charger $50.00
50.4V 3A Lithium Charger $46.00
Not too bad for complete packs with bms & charger ($340 or $395 + $46 for 3a charger = approx $400-$450 all in)
They also "recommended" the Panasonic NCR18650PF 2.9ah cells but I am opposed for my specs because it is half the 20a discharge per cell of the Samsung at only 10a max discharge, (or about 3C rate per cell)
"Panasonic single cell could do 10A continuing, then the 12S4P could do 40A continuing."
W/Bms:
12S4P 44.4V 11.6Ah $368.00
However, they even confirmed the Samsung would be better for my purposes:
"If it needs to keep discharge at 35A, even if the battery pack could do 40A, but it almost reach the limitation of the battery, this will shorten battery life. It will be much easier for Samsung 25R / 20R with lower heat and will give a longer circle life."
Now comes the bad part:
SHIPPING to San Francisco, California...ouch!!
"As the complete battery pack is about 3kg, shipping cost is very expensive, to ship 1x 12S5P pack + 1x 3A charger cost $265.00 by TNT Express (which is another express carrier like UPS, Fedex etc) , this is the only way to ship such big battery pack, UPS / Fedex / DHL do not accept battery pack over 2kg. TNT Express take about 6-8 days deliver to door. And we will label a lower spec. on packing to make it easier to ship."
WOW - so the shipping is almost $300 and the battery/bms/charger is $400-$450...crazy, won't work for me unfortunately as I am not willing to pay nearly the entire cost in shipping as the battery pack and charger would cost...
They went on:
Just for your reference, shipping cost for sending 20x 12S5P pack by Express cost about $860.00, this may lower down the shipping per unit (about $43.00 for one pack). Or we could ship by air mail for 20pcs (or more), that will be lower cost than express, we could even ship by sea transportation for volume orders that will not have much restriction for Lithium battery.
But for sample order like 1~2pcs, its just the only way to ship..."
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So much for Supower unless someone had a large order and wanted to chip in...the shipping is a killer at this point, doesn't matter for loose cells or whole packs, at least from their company - please let me know if anyone found reliable, quality, real Samsung 25R cells in relatively small quantities (60 -100 cells) without more than a $1 a cell shipping or $5 a cell raw price....
Will have a few other suppliers info back shortly to report as well
marked hazardous li-ion 
