Top critical review
8 people found this helpful
OK tester with unintuitive user interface
on February 27, 2016
This tester does not have the most intuitive user interface; sometimes gets "confused" and requires a reboot to set mode and/or parameters. The minimal user manual documentation could be greatly improved. Does seem to test batteries well once test is set-up and initiated. Each cell can be independently set-up and tested or you can set up all for the same test. Has discharge, charge, quick test (measures internal impedance), discharge/test (measures cell capacity), and recondition (multiple charge/discharge cycles) modes. Control over discharge and charge currents (max varies depending on number of cells tested). Measures individual cell voltages. Can be used with just one cell (unlike other testers I've used, which require testing in pairs). Did find that if a cell is completely discharged, the tester won't recognize that it has been inserted and indicates "null" on the display (no cell present). You will have to use an external "dumb" charger to bring the cell voltage up enough for the Opus to recognize it. Kind of an irritating problem for a "smart" charger. Another silly problem; using the included cell adapters for larger batteries renders the quick test useless due to the high resistance of the adapter contacts.