below I can provide possible solutions from your given information:
(What is an RTC battery?
The Real Time Clock (RTC) battery provides power for the internal clock/calendar and for maintaining system configuration settings. This error can occur when a machine has been left turned-off for an extended period of time (approximately one to four months), and it is the result of a depleted RTC battery.)
But to be precise I would suggest to contact your sales manager or write issues you encountered directly via our Teltonika Energy VIP HELPDESK system.