Makita battery - USB-C charging

[kat]

I found this knock-off Makita battery charger that is able to take power from a USB-C PD charger.
So basically you could charge Makita batteries through USB-C. Charger is also much more compact that the original Makita bulky AC charger.
And this charger does both input and output!



...but.. how safe is this for the batteries?
Because I see on the back that it only has 2 rails, for -/+. It has no connections to the middle yellow housing with 7 pins like the original AC charger does.
So I assume it does no balancing?
Is this bad for the battery?

[BILLPOD]

Good Morning Kat, get one of the USB testers and insert it into your circuit and see what it is doing.   You need a tester that recognizes the quick charge modes, like the phones use.   The tester I like is the J7-c,
which is found everywhere.