Update to my original post - I recently purchased and tested the SunnyLife 4+2 Mavic 2 parallel charger. It DOES NOT get hot(93 deg F) and it doesn't have the issue of cycling on/off during charging.
Here is the link from Amazon...
Received the “new & improved” version of Fstop Labs Mavic 2 Battery Charger.
Good news is that this newer version doesn’t have the overheating problem nor does it cycle on/off during charging.
Here are the not so good news: It still gets hot, 120 deg F (vs. 146 deg F). They reduced the...
Update - I received a message from the reseller, he is indicating a "updated" version is forthcoming to address the overheating problem... I've now returned this charger via Amazon.
This charger gets really HOT, 146 deg F during full load, ie 3 Mavic 2 batteries + RC + 10" Samsung tablet. Too hot to touch. Worst is that it starts to cycle on/off during charging of the batteries. It's overheating, unsafe and bad for the batteries.
I also have the same charger for my Mavic...