Electronic – Wiring problems on the TP4056 Module

A 16V power supply will be insufficient for your build. You need at least 17V supplied under load.

You could use a notebook charger rated at 19.5V. The protection circuit will handle the limitations, but you have to make sure that the charger can supply sufficient current for the whole pack. At 4 parallel cells, you'd need at least 4A supplied current (and use a charging at 1C).

Other than that, para-series charge is not generally recommended because a single bad cell over time will discharge the pair, which will not fully charge, which will end up with a bad pack consisting of 1 bad pair, 2 relatively good ones and 1 very good one.

I have 3 18650 in my galaxy s4 mini with cyanogen 14 android version 6.0.1, use mine as a normal phone as wlell as an ap at home as its faster internet at up to 65 meg, works a treat and charges fine but had to add a charging pcb that also doubles as a USB power sorce, was from a pound shop portable mobile charger.had to add a switch between battery's and phone to turn it off fully to reset the phones battery meter as does not recognise when its fully charge. Lasts a couple of days with normal use. All in all very pleased with results so far. About 4 months.