The DJI BS30 Charging Station has three charge modes.
Standard Mode
This mode charges one pair of batteries at a time to 100% one after the other. Take note, however, that batteries degrade over time. Keeping the batteries at full charge for lengthy periods will likely hasten that degradation...
It is perfect & does everything it was intended for, but just won't work as a backup for my photography. I thought it would work as a SAR for my community & good backup. It has about 15 flights on it & works perfectly in every way. Comes with M30T, RC Plus Pro, 6 batteries, top mount, DJI Pro...