I've soldered wire extensions to them with neodymium magnets, allowing me easy attachment to my Lii-500's rails:
1A/0.5A NOR testing right now, tomorrow evening will have the ≈0.1C down to 2.8V capacity figures.
Their internal resistance seems to be typical of high capacity batteries. Will DC IR them if someone gives me a hand to operate my precision power supply while monitoring my voltmeter.
Don't ;-) worry maukka. I'm an experienced mains jolt :-D jig dancer, this is child's play to me.
I once showed a photo of a Lii-100 with a 6-pack of 18650 cells charging underneath in an E-CigaretteForum thread. There was at least some weird comment(s) speaking about fire extinguisers :-D or something:
While not a problem for cells which are going to be set in parallel consistency is bad. Average capacity down to 2.8V at ≈0.1C: 4535.5mAh, 90.71% of rated one.
The bays were not designed to hold prismatic cells, let alone allow for proper contact on their wire terminals. Since I can low temperature solder and had small neodymium magnets, I chose that way.
May look precarious, but it really isn't. O:)
Heard something about new li-ion batteries gaining capacity over the first cycles, but never investigated it besides noticing a slight gain after one cycle on a few low capacity Heter laptop pulls.
Do you have any information on how much gain is to be expected? Over how many cycles?
I doubt they are higher voltage cells. They would claim it somewhere, doesn't it? Nominal voltage is 3.7V, higher voltage cells are specced above that figure.
Yes, I know smartphones raise their battery voltages up high. I've always had a battery monitoring application installed.
I didn’t see any hint of the termination voltage in the AE listing.
Also, LiIon batteries used to be rated 3.6 Volts a few years ago, 3.7 being the exception.
2S packs are usually rated 7.2 Volts, 3S packs are 11.8 Volts, and 14.4 Volts for 4S packs.
So who knows?
And how can you find out for sure?
None the less, judging by the NOR test capacity, it seems they’re 4.2 Volts termination voltage.
As said, they may reach the promised 5000 mAh after a few cycles.
Did DC internal resistance measurements by injecting ≈3A of current into their short wire leads while monitoring voltage over them with my ZT102 multimeter. At a maximum loaded voltage current was suddenly cut off and unloaded cell voltages were recorded 1, 2 and 3 minutes after cut off (all values in millivolts):
instead of using your cylindrical cell chargers for everything.
Weird.