Very nice curves with good tracking. On one of the cells the overload protection trips during a 7A discharge.
My result is below rated capacity, some of the reason is probably because I terminate charge a bit early (100mA instead of 50mA) and do not discharge to 2.5 volt, only to 2.8 volt.
Conclusion
This cell has about the same capacity as a 3400mAh cell, but handles load a bit better.
I will rate this cell very good.
Notes and links
The batteries was supplied by Keeppower for review.
Thanks to HKJ.
I am in the UK , but where can these be purchased from I did try a illumn but it seems they’ve been broken into a while ago so I think that’s quite slow at the moment right?.
It’s costing me USD$41.00 shipped to london.
Any place better?.
by the way these will be used in a HDS Clicky.
Thanks.
The button-top on the Keeppower definitely looks different as the stock Sanyo GA and LG MJ1 are flat-top batteries straight from the factories.
As the spec sheet of this battery at Keeppower website listed this cell is Made in Japan, we can assumed it is the Sanyo GA Keeppower 3500
Normally Keeppower will list the cell’s country of manufacturer for their batteries, for eg. they have 2 types of protected 3200 batteries, one is listed as cell Made in Japan (Panasonic BE) while another listed as cell Made in Korea (LG E1 4.35v).
Their IMR 3200, which is listed as cell Made in Japan is most probably Panasonic BD since it has continous discharge current of 10A
The protected EVVA 18650 3500mAh battery (with the GA cell) has very similar discharge curves (on the HKJ Comparator) to this Keeppower, at loads of 3A and under. But at loads above that, the EVVA has noticeably less voltage sag, presumably because of a higher current protection circuit.
HKJ, I bout a west mountain Radio CBA IV to test cells with. When I do I keep getting these little “squiggles” at the very end of each line of the the chart. Its like the machine lets up off the test and then starts again leaving that little ripple at the end. Do you know how I can eliminate that?.
I did use a CBA for my first battery tests (2010 & 2011), but do not remember any squiggles. If the CBA continues to record after the current is stopped you will get a raising voltage, is that it?
Yes. What I need to know is if its possible to squash that. There is a setting I found that says something to the effect of “rebound voltage” (don’t have it in front of me at the moment) but regardless of what I set that to this still happens.
It looks like you may be out of range. 0.6V is rather low and the load may do strange things at that voltage (That is said without checking the specifications).
When testing significantly below 1V you have to know what you are doing, a lot of test equipment may fail or give wrong results. There are a couple of reasons for that.