Controlled Discharge of Lithium Ions

Discharging and Controlled Discharging of Lithium Ion Batteries


Discharging to 7.0VDC
This is for normal use and should be used 99% of the time.  7.0 volts under a 1amp load is what Fromeco considers out of gas under conditions where loads are unknow and flight times may vary, (every day flying).  This is the limit for discharging under flight conditions.  It is very important to not confuse this with doing a very controlled discharge test.  Yes the 7.0VDC is slightly conservative, however with Lithium XXX chemistries the discharge curves for the end of charge are very steep, (read little to no warning when pack is empty).  It is very important to respect this under flight conditions.  7.0VDC @ 1amp for 7 to 10 seconds.

Discharging to 6.0VDC
This is for doing testing~Fromeco recommends this should only be done by folks that have experience with discharging batteries. Why can you discharge a Lithium Ion pack to 6.0VDC for testing and not in flying conditions?????
Discharge tests are done under controlled conditions, the rate of discharge is controlled, the Voltage that the packs is being discharged too is known.  There is not RC equipment at stake. 
Caution must be used when doing discharge tests. 
1.) The pack should not be discharged lower than 6.0VDC, there is no usable data gained from going any lower.
2.) This should only be used to check the Capacity of a Battery Pack.  Do not do these tests to test the Maximum out put of these batteries, we have done these tests under contolled conditions, we can tell you what this is. 
3.) The rate of discharge should be less than 500mAh to ensure accurate readings. 
4.) Tests should only be done when absolutely required. 
5.) The pack needs to put on charge as soon as the test is completed!!!

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