Very neat construction!
But I don't quite understand what I'm looking at.
Is this the new 14s60p (looks more like 90p, if not more) charged to 4.15V, and you want to insert the packs of your old battery (now at 3.5V) into the empty slots on the far left and far right?
If so, definitely equalize the voltages before connecting! If you don't, you will fry your old packs.
I suggest you get a "Laboratory Power Supply" such as this one:
https://www.amazon.de/KKmoon-Schalt...netzgerät+60v&qid=1566004307&s=gateway&sr=8-5
With this, you can easily set the output voltage as well as limit the max current. Very useful when you need to slowly charge something (eg. your Battery#1) to a specific voltage.
Also order the banana clips - they are not included in the package.
How to use:
Just a little nitpick regarding the units/spelling/capitalization in the interest of education. A lot of people seem to be confused by this, but it's not that difficult.
KW <- this would be "Kelvin Watt" - not what you mean
kW <- this is "kilo Watt", a unit of power. Eg. the power output of an inverter is measured in this
kW/h <- this would be "kilo Watt per hour" - not what you mean
kWh <- this is "kilo Watt hour", a unit of energy. Eg. if an inverter outputs 0.5kW for 3 hours, you get 0.5kW*3h = 1.5kWh of energy.