So was looking for a compact charger for field use and came across the M4 by ToolkitRC so decided to pick one up and here is a brief review of it.
I will be updating the review as i go along as I don't want to write a massive post for it to all disappear after hitting "submit"
I ordered the charger and the SC100 cable, the cable is not required to be able to use the charger.
Input voltage is 725V and can be via USBC or XT60
Output is via XT30 or XT60
Connected to my 13.8v AC/DC PSU
So screen is pretty self explanatory.
Top line - time - Input voltage - Charger temperature
Second line - Cutoff voltage
Third line - Charge rate 1A 2A 3A 5A
Left - Battery voltage and charge information
Right - Cell information
Single button - Holding down for 1 second switches charge rate - Holding down for 2 seconds changes cutoff voltage
Connecting a battery
Took 70 minutes to charge
I also tried it connected to my Allpowers portable battery bank as this is what i was looking to use in the field. USBC outputs a good 20V.
As you may have seen when connecting a battery discharger and balance cables it's very "tight" so i added extensions cables.
My usb cable also displays watts.