The batteries I've been testing are those used in small UPS, Pb (AGM) 12v, 6Ah to 18Ah
As usual, the battery datasheet must be observed, but in general for 12V/7Ah, the settings are, I.discharge = 1.2A and V.stop=10.5v (1.75v/cell). Under this circumstances it is expected a 5h test duration and 6000mAh drawn from the battery, if in good condition.
Multiple test conditions could be adopted, but to my needs a 5h run to test a good battery with a discharge (6Ah) near the stated (7Ah) that would take 20h, is a good compromise.
Obs: The batteries are fully charged, prior to the discharge test be done
1) As an example, from the datasheet of the Ultracell UL 7-12 we can extract the test conditions to set (1.2A;10.5v), and what to expect (5h;6Ah)
Another test option could be for instance, the same V.stop=10.5V (1.75V/cell), but I.discharge=1.79A, and then should be expected for a good 12V/7Ah battery a runtime of 3hours, and 5.37Ah
2) As another example, according to the datasheet of the Ultracell UL18-12, with the discharged settings as I.discharge=3.06A and V.stop=10.5v (1.75V/cell), the test for a good battery should take 5h and the battery should provide about 15.3Ah (see attached datasheet Ultracell_UL18-12.pdf)
3) An example of a test to a Pb battery, 12v/7Ah in end of life
After 10 minutes discharge
After 40 minutes discharge
After 1 hour and 8 minutes discharge
EasySDL has a reported problem of the time axis, with the time stamp being half of the real time.
4) An example of a test to a Pb battery, 12v/7Ah as new (over 5h run and over 6Ah delivered)