Semi-button top - the button protrudes about 0.1mm from the top of the cell.
Unprotected
Diameter 14.2mm, length 49.9mm. For comparison, an Eneloop with my calipers measures 50.1mm length and 14.3mm diameter. Both lengths include the button.
Capacity at 1A discharge to 3V (Turnigy Accucell 6) - 558mAh. Will try the other three to get average numbers over four of them.
What can I say , thats bad , real bad .. Hopefully this will give anyone reading these posts some idea of what there getting when they buy the cheap chinese cells .
These come with a 100 % money back guarantee (which I feel I will be claiming soon)
Initial discharge results at 500 ma.
1. 0
2. 4
3. 2
4.0
These were discharged and showing less than 1 volt.
I am currently charging and then will discharge but I am not expecting good results. They are made in China and it does say they should be charged before use.
Hmm I may be proven wrong
Charged at 500 mah
1. 1.44v 883 mah
2. 1.46v 1061 mah *
3. 1.46v 1091 mah *
4. 1.46v 1196 mah *
* They sat on 1.46 volt for a long time and kept taking charge??
I may see good discharge results. However they are NOT LSD and in real use would be poor I imagine.
results
1. 785 mah
2. 794
3. 814
4. 822
on maha c 9000
Quite good but for the price I'd rather have eneloops. Will recharge and leave for a week and then discharge.
Ok , discharged the 2400mAh Xtar cells @ 500mAh from 4.2v down to 3v ..
Cell 1 did some 2468mAh
Cell 2 did some 2485mAh
Now this is quite a first for me , cells actually exceeding stated capacity .. [ Well done Xtar ] , Its late , and I will discharge the 2600's tomorrow .
The first Xtar 2600 built on a Sanyo 2600 has been discharged .. And much like the Sanyo I tested a little while ago Here , the capacity tested was very close ..
2433mAh for the Unprotected Sanyo , and some 2448mAh for the Xtar [ Sanyo 2600 based ] , Im currently waiting to put in the second cell , and I want to time it so it will finish a little after I get back from the Flashlight Meet tonight .
Ok , back from the meet , and the second one went 2438mAh .
Next will be some discharge [ for current ] tests ... , So hopefully will be able to post a review shortly .
In case anyone was interested, just finished up recording a rundown test on a 11.1V li-ion protected pack made out of the Sanyo 2700 mAH cells (UR18650ZT).
The test was using a 10W halogen bulb as a load, so almost a pure resistive load. Average current draw was around .8 amps. Results were very near the ideal 2700 mAH capacity (at room temp). More importantly, the percentage increase in run time over the 2200 pack (roughly 23%) was right on the money. Cells came from SoShine. According to the manufacturer's specs, you do pay a hefty penalty with discharge currents above 1C (2.7 amps).
You can see the voltage vs. time plot over on my site:
These cells aren't entirely new -- I bought them together with the C9000 a couple of weeks ago -- but they've only had a break-in and/or refresh/analyze cycle and a couple of very partial cycles in a flashlight for a couple of the cells. I ran two cycles of 500mA charge/500mA discharge and am reporting the second (which was 10-15mAh higher), so call it the fourth cycle overall for the cells.
I don't have calipers (so I eyeballed size...) Edit: Measured one at 44.30mm x 10.17mm with digital calipers.
The other package of NiMH cells I bought together with the C9000. These have been discharged (didn't write down the numbers, but around 1700-1800 mAh out of the package) and then given a forming charge. They then sat a couple of weeks until I started them cycling for this test. They're actually still in the charger on a third cycle, but the numbers are quite close between the first two cycles, with two cells showing higher capacity in the second and two cells lower (differences of 11, -25, -17, and 10 mAh).
[Edit: the numbers for the third cycle were virtually identical (differences +1, 0, -2, and +4 mAh), so I'll let the 2nd-cycle numbers above stand.]
The reported capacities during the break-in cycle were also around 2200 mAh, so it's not simply voltage sag at 1 amp causing the low numbers.
Edit2: Digital calipers say two of the cells are 50.32mm x 14.08mm and 50.30mm x 14.07mm, respectively.