Any idea what the maximum battery voltage is for the mUPS?
I want to build packs with 18650 calls with nominal voltage of 3.7 per cell, so that puts me around 14.8 fully charged with 4 series batteries.
Also, what is the charging voltage output by the mUPS?
Don’t forget to balance the cells during the charge…
Probably use a 4S BMS chip but I need to know the details on maximums etc
https://mikrotik.com/product/mups
Looks like you cannot surely expect 14.8v because the lead / gel / car batteries are 6 cells by 2.3v - 2.45v. It means 14.7 in total. Actually the voltage should be somehow adaptable to different battery used in each case. But I doubt so. I have no personal experience with the device and it is nothing like that mentioned in product description. May happen it will work for you well, it worth trying it.
Have you noticed that the charging voltage of 18650 is 4.2v?
You can go 3SXP and X can be replaced by 2 or a higher number. You can look at a Godox PB960 and only use the battery pack of it. Use the charger plug on the side and it also supply power back from the cells.
Voltage is between 11,1Volt and 12,6Volt using 3S2P and a capacity of 4300mAh