I've read the two threads about battery powered DS1054Z and want to make my own soon.
Li-ion batteries and cells are my specialty, coming from the DIY ebike world. A 20S (72 V nominal) battery is easily done, but would it not be possible to feed the scope with battery power thru diodes (and fuse) straight into the PSU's primary side's capacitors, bypassing the rectifier bridge?
If this is feasible I could plug the 230 V power cord in and out as I see fit for the task at hand, making the switch from stationary to portable easy while keeping the power on. No current should run backwards into the battery leads, right?