Test/review of Charger NiteCore UM4

Hi!
I just bought this charger, but I’m really displeased with it.
The time sharing charging was a bad surprise, but there are worse things
The charger overcharged a 4 pack nimh batteries of mine when I left it for overnight.
The batteries always charged fine with Nitecore D2, but this charger never terminated the charging of the 2500mah batteries and pumped 7500ma into them, causing them to overheat.
The charging status was not even in the last segment.
Im considering to never use this charger anymore, but it keeps me wondering, what could have caused this.
Do you think the timesharing? I suspect it’s harder to detect a full battery, when they are charged in 5 second pulses.