Well the replacement LIPO got it’s first test today on the summit with the low voltage alarm fitted. The alarm went off a LOT earlier than I expected and even when I turned off the 40m amp, the alarm kept sounding - I had suspected this might happen and so had a screwdriver ready to take the amp apart and remove the alarm from the (internal) LIPO cell and connected my backup external 4S hard case LIPO, to continue the activation.
On getting home I checked how far the cells had gone down - Cell 3 was still at 56%, Cell 4 at 48% but Cells 1 & 2 were at 0% (Zero). The only thing that could have drained the first two cells at a different rate to cells 3 & 4 is the alarm itself (which I have had connected internally in the box with its LEDs running for the last 2 days).
The amplifier is powered from the propper output leads from the LIPO, so it cannot have caused the drain of just two cells.
By the way after getting the new LIPO 3 days agao I fully charged it - all 4 cells were showing 100% charge.
Moral of the story, so far - beware the alarm plugs! I’ll try to see if I can bring the charging connector outside of the box, which will make it possible to only attach the alarm during an activation and also allow charging of the LIPO without having to take the case apart.
Of course this could also be simply a faulty LIPO - I’m recharging it at present and then I’ll see how it behaves on the next activation.