This got lost in the last thread but I am still looking for someone to measure the output voltage from the MX-L battery sled when one and two batteries are attached. I would like to see if this is native 8.0-6.8v from the L series packs, 16-14v in a series or if it is knocked down to ~5v usb voltage with some sort of built in regulator.
I measured mine last night. The batteries are wired in parallel, allowing for hot-swaps if you're running really long takes.
There looks to be a little compartment door held on by a screw that could feasibly house a regulator, but I didn't want to dig in too deep and potentially mess the sled up.
The output (not under load) measured at 8.1vDC, which is the exact voltage of the higher of the two batteries. With that battery removed, the output measures 7.9vDC, the same as that battery that's inserted. Seams to me that it's just a parallel hardwired pass through.
When changing sleds between the 4xAA and the Sony batts, the MX6 pops up with a message saying something along the lines of "battery voltage mismatch. Switch to Alkaline/Lithium?" Same thing happens if you load a preset that was saved with a different battery than what's in there now. So the device is measuring/regulating the voltages inside.