Venus OS v3.70~49 - After reboot "low battery voltage" alarm

When rebooting that beta version it comes steadily up with a “low battery warning” (BYD LVL 15,4).
Battery was in that moment at a 52,3V level, so far before a low voltage. After 1 to 2 minutes the alarm gets cleared again.
In previous stable version this was never an issue.