So I got round to ordering a DCDC boost converter and a battery level indicator. Unfortunately i ordered the wrong battery level indicator, I order one for a 5S pack not a 1S, so I have 2 options: 1. order a new one (more expense and another month on a slow boat from china) 2. modify the one I have.

I briefly looked at the board and it appears to be based on the LM339 comparator, so am expecting just a few resistor values need changing and they are 0603 size, so not completely impossible to rework.