We have tested the TS cells using the TS Ningbo charger, we have talked with TS Ningbo and two of the larger users of the TS Ningbo cells in China.
Thundersky is a complex and unique situtation (company) and one MUST use caution when getting involved with the procurement of their cells and be VERY cautious about what any seller provides to you.
We found 6 cells out of a 14 cell EVAL pack were only capable of 27 AH capacity at 18.8 amp loads. The other 14 varied somewhat disturbingly between 35 and 39 AH after only a few cycles without a BMS using the TS Ningbo "balancing charger".
Our charge tests proved numerous cells went well beyond 4.25 into the 4.6 to 4.9 range and some exceeded 5 volts. This of course means other cells were undercharged and at greater risk to go under 2.5 vdc when discharged as a pack as there is no low voltage protection without a cell by cell BMS and the reliance is all placed on pack voltage.
Our testing proved that up to 3 cells can go below 2.5 while the combined string voltage remained high enough to allow the vehicle to continue to discharge, further damaging the low cells.
We had one cell swell up and it no longer charges.
On the 6 cells that only have 27 AH, they are missing the RED and GREEN TS caps and do not have the ink imprinted Bar Code and Date Cobe Serial Number.
We too have been looking at Elite Power, and will wait until the cells are in and we are provided pictures and dates codes before purchasing, although the picture of the cells they display appear to be correct.
Operating the TS cell without a cell level BMS to protect from over and under voltage and to provide voltage equalization when the cell(s) are > than 3.501 vdc is folly.
We have designed and are waiting on a delivery of a lower cost BMS for the TS cells from Taiwan, due in 2 to 3 weeks, that will provide the required protection for under $500 and will provide two 5 volt signals, overvoltage, undervoltage, to be taken to the charger and EBRAKE to cutoff the charger on overvoltage and cut off the controller on undervoltage, at the cell level.
Elite has establsihed contacted with us in the past, I have no reason to doubt them at this point.
We had a lengthy post on TS testing, we have pulled that post as this is an ongoing discussion between us and TS and others in China right now.
We have posted a smaller condensed version of that at the following link.http://www.voltsrider.net/vr/forum_posts.asp?TID=179