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if the 12V battery voltage drop. BPCM will wake-ups HV battery during the sleep cycle to charge 12V. during normal run cycle 12V battery is a buffer for the pulsing (PWM) 12V PIM charger. without good buffer there is high risk of damage to sensitive electronic components, such as EVCU OBCM BPCM CTM ORC and so on ...
 

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2013 FIAT 500e
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Discussion Starter #22 (Edited)
Okay, so don't run it without a 12V battery connected (I hadn't planned to).

If it goes below 11V during extended parking, you say the HV would keep it charged. 11V should be enough to start, so I might not need to bother with its switch, even for extended parking...(continued below)

check the initial charging current for the small (probably AGM battery or similar)
It is AGM, & I repeatedly felt it thoroughly, but it stayed quite cool when charging from as low as 11.38V. I'll be monitoring the charge temperature closely in order to see whether I still need to bother opening the hood while charging, as is my habit with the OEM right next to the hot electronics box.
 
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