Obviously, doing this over and over takes a toll and ultimately as the cycles continued, some of the batteries started to fail the capacity test by reaching the cutoff voltage
before they were supposed to--in other words, the capacity dropped below the 80-percent level--at which point we stopped testing that battery.
With additional knowledge of the electrical current profile, along with temperature and cutoff voltage
, the required "capacity" of the battery can be calculated.
15 and 16 demonstrate a narrowing of the conical top envelope associated with increased cutoff voltage
, which has its experimental counterpart in experimental behavior under increased pressure.
The dedicated tester is a push-button, walkaway design with the capacity percentage displayed after the tester automatically shuts down at the proper cutoff voltage
With the VDC Battery Minder, on the other hand, we would like to see a higher charge cutoff voltage
for optimal charging and a lower voltage trickle mode for long battery life.