Hello,
about issue 1: This was changed after I published the repositry. Apparently there is a capacity scaler implemented in here: ardupilot/libraries/AP_BattMonitor/AP_BattMonitor_SMBus.cpp at master · ArduPilot/ardupilot · GitHub, which gets set to two for the Maxell battery: ardupilot/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Maxell.h at master · ArduPilot/ardupilot · GitHub Although I’m a bit surprised by your measurements then, because as far as I understand it, the full capacity should also get multiplied by 2…
About the second issue, did you read this?