parabellum said:
There is little to no information (independent) about those cells and it looks a wonder, because they seem to be 2013 stock. I just ordered a box of Tenergy 32650 and hope for ~ 90% of stated capacity. I have a reason to believe that Tenergy is = LFR (unlike Fullriver, with some bad reviews but similar price and appearance), markings on the metal shell of the cell seems to be almost identical, some numerical variation in date and 2 more digits vary from sellers pictures. Have contacted a guy who purchased a box and he says it must be about legit capacity. Fingers crossed, will report back.
P.S. There are Fullriver 26650 7p blocks (spot-welded) from 2014 (as it looks like from the pictures) 3.3Ah cells. Very nice assembly for future pack build but, I am afraid of the 2 ES posts, stating they are real BS.
Before I pulled the trigger at eBay, I chatted with someone at insightcentral.net who has purchased, tested and used the Tenergy (LFR, whatever) cells to build a motorcycle battery. In the forum, he estimated the capacity at about 2.6C at about 4800mAh, in a very crudetest. Chatting with him gave me some confidence. I think he bought his back in October .
I also spoke with Doug'sDeals. They acquired the cells in June of last year and stated that after 3 cycles the cells tested close tofull capacity, though they weren't more specific than that.
I saw a couple of negative comments about the Fullriver cells too, so I shied away from them.
88% is close to 90.
The single cell capacity tests I did were in a first attempt at a battery holder, and the contacts were loosey goosey, so the contract resistance undoubtedly affected the results.
In the 10p test on the V2.0 rack, the contacts are super tight. However, with 20 contacts, even though the total resistance would be the reciprocal of the sum of reciprocals, it could still affect the results.
By the way, the cells I received have Tenergy on the box. My micrometer measures the length at ~70mm, so they're 32700s.
Also, regarding my capacity tests:
The single cell tests were charged to 3.5V down to C/100 A and discharged down to 2.8V.
The 10p test was charged to 3.65V to C/20 and discharged down to 2.5V, per Tenergy's 5000mAh 32650 datasheets.
All things considered, they could have 5000mAh, as stated elsewhere, given the flaws in my procedure. I reported 4850mAh based onmy 10p test.