Four-wire test socket 18650 test fixture / resistance / capacity testing necessary
Professional model battery charging ， discharging frame
Professional battery internal resistance test stand
Professional four wire clamps
Battery testing necessary
Current alignment recommended welding outer screw， or with the copper extraction. Voltage wire recommended weld the centre probe.
We come to a universal principle and advantages of the four line test:
(1) line four test two test current role: with 2 lines of them received on the resistance to be measured. So no matter how big the contact resistance and the lead wire resistance， current is constant (a series circuit current everywhere equal principle).
(2) four line testing two other voltage test point role: two other voltage connection， because the voltmeter input impedance is very high， so it can be considered 2 root voltage lead is not drop， so no matter how the contact resistance and the lead wire resistance much also is not affected.
So the 4 line test achieved can completely ignore the most accurate test of the contact resistance and the line， this is the two line test can not be completely ratio.
Product parts， needs its own assembly. (without battery)
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