Please find the attached image showing amaron quanta 12 V 100 Ah VRLA battery discharge chart at constant current rating. I am bit confused that how should I calculate the battery capacity based on that.
In the table they shown end cut off voltage like 1.3 V, 1.55 V, 1.6 V, 1.7 V, 1.75 V and 1.8 V and corresponding ampere in table like 5 min, 10 min, ....5 hr, 10 hr, 20 hr etc.
If I simple take 10 hr reading then 1.6 V = 9.72 amp 1.7 V = 9.49 amp 1.75 V = 9.31 amp 1.8 V = 9.26 amp
Out of all this what parameter to be consider in discharge test. Most searches says that it should be 1.75X6=10.5 V is the cut off voltage and related to that constant current to be passed. but if that is the case why manufacturer is giving 1.3 V, 1.55 V, 1.6 V, 1.7 V, 1.75 V, and 1.8 V etc. and current parameter for that. If I take 1.6 V and related to that 9.72 amp as discharge current does it will show different capacity of battery or it will be the same regardless of the cut off voltage and current rating.