How many significant figures need to be posted for these values? IMHO the first column could be rounded to 1.31 unless this two mV difference means something.
By way of answering, how sensitive to room temperature are these voltages? What the accuracy and resolution and repeatability of your meter (you may be seeing variations in your meter)?
The trees and branches and leaves can hide the forest.
Good work Don, I have purchased 4 of these to try. I look forward to your future tests/conclusions, I’d be interested to see any results you have even if others aren’t ( they don’t need to read the thread do they :zipper_mouth_face: )
Mine all arrived at exactly 1.309 (Fluke, calibrated to nation standards)
First discharge cycle netted;
1 - 1975
2 - 1966
3 - 1965
4 - 1970
Ambient 19c, results from my uncalibrated Maha. The glaring omission is the lack of discharge rate, I forgot to note this as it is decided by the charger based on capacity, which I set to 2500mah, if I get a chance I will check and update :8)
Thanks Don for all the hard work here, following your post ordered one set myself to see what all these are about
Ordered from I Cell - look like 2nd gens as you say comparing sanyo’s have on hand here.
Not yet. Nor will there be soon. The quickest way of getting conclusive proof would be to check the business press to see about the details of any deals between Contour Energy (A US firm who own contourenergy.co.uk) and Sanyo/Panasonic. Since I rapidly lose the will to live when looking at biz press releases, I’m not the guy to do this. There are probably SEC public record filings as well.
But there probably is a public record of Contour Energy (?Systems) doing a deal with Panasonic (Who own Sanyo).
I can only produce indicative stuff depending on the relative performance of some of these against a smaller number of genuine Eneloops from the same generation. (16 Contours & 8 Eneloop Tones (2G))
My opinion is they almost certainly are 2G Eneloops, but I have no data to back this up. Since I can only discharge one set of eight a day, and they are still in their first couple of cycles, it’s going to take a while to get the data.
The limiting factor is the Maha C808M I’m using to charge them - for maximum charge the cells need to spend 24 hours in it.
I could change the regime and use a hobby charger to charge all 16 at a time but that would rather invalidate the previous results. I’ll have a think about charging regimes while I’m on holiday in about an hour from now.
Chicken drumstick -
Having both sets here to compare myself all I could say is the physical characteristics,similarities in the end caps, same size, colour and appearance in grain effect of steel they look pretty close, it isnt scientific conclusion however at £3.99 pack delivered was worth a risk.
The way I read it DCC acquire companies and brands, doesn’t look like the make anything themselves more a service provider with no manufacturing facilities.Contour doesn’t actually say (cant find) they have own mfg facilities beyond Test and R & D facilities i’m bit pushed for time to wade through pages of stuff.
My monies on from Panasonic/sanyo they provide OEM services for others, they look so similar to me, although there is a raft of other known manufacturers such as Sony Fujicell, Yuasa,Mitsubishi,Hitachi.
Would the bigger japanese players be cloning other competitors products ? I’m out on that one
It’s a little simpler than that. Would you, if you were Sanyo let someone call their batteries ‘the worlds best battery’ unless they had your cells inside?
Yes, but what I mean is the fact that they would not be allowed to call them the ‘worlds best battery’ unless their competition agreed with them. Or supplied said cells of course. Sanyo eneloops are generally considered the best, therefore so are Contour. To me without them actually being eneloops they could not make that statement without a very large court case.