I've a DC motor (brushed) that is driven by a set of 12 Ah 12 V lead-acid batteries. When motor stops moving, I assume that all the current (at least most of it) in the batteries is drained. However, when I check the voltages of each battery they are well above 12 V. The motor has no load current consumption of 2.2 A and peak current consumption ~15 A. So, I would like to know at what voltage all the 12 A of the battery are discharged? Why would motor completely stop moving (i.e. with no load) when there is full battery voltage left? (Is there something wrong with the motor or I am missing something? - BTW motor heats up quite a lot)
*** Motor has fused by now so, this probably is not entirely relevant practically. The problem was that brush board of the motor was loose and got in contact with the coil resulting in shortage. However, this is theoretically still a valid question.