During the normal routine battery change you have something like 45 min to 1 hour to put new battery once you disconnect old one. Anything more than that, the ecu will reset. Few people confirmed me that.

Yea i have one of those electrical chargers which stops when battery is charged and keep the charging level on battery, also it's kinda safe for newer cars with electronics, i can connect it directly on the battery while it's on a car. The problem is my car is now on the street so i can't get cables through my whole yard and leave charger on street.

The products where are images from are on my language (Serbian) so i found you this one from aliexpress, they looks like they are the same. I put the links in the question.

Well i don't know, from the specifications both are supposed to be OBDII and supports all interfaces, like reseting errors, proxy, airbag, changing mileage, etc...