I want to build me an electric longboard, and I was planning to run it off of 4 or 5 11.1 volt laptop batteries... I want to wire them in parallel (The sets of 11.1 volt), and charge it as one big battery with only 2 wires... (If it's possible.) I have a TRITON Electrifly computerized charger/discharger wit one three pinned thermal probe, for Li-Ion, Lead Acid, NiCad, And NiMH batteries. I need to know how to wire the batteries (If it isn't just straight forward + to + and - to -) and what my settings should be on my charger. If there is any information that you need, just ask, and I'll try my best to get it to you. Thanks!
You may not be able to charge multiple cells at once with this charger, unless it features a balancer (or even multiple channels with separate control). If charging multiple cells is supported (which is not uncommon for RC model chargers), then read and follow the manufacturers instructions.
The reason for this is, that the charger needs to know the current in each cell. This is not possible, if you simply put them in parallel.
For laptop batteries, you will likely not be able to charge them at all, unless you rip off the casing and connect to the raw cell.
CAUTION: Lithium cells may self-ignite or even explode if mechanically damaged or overheated or shortcut. They may do so after a while even if they look OK initially. Several Samsung S7 have melted, just because the battery compartment is a fraction of millimeters to small.
When working with lithium battery cells (charging or pulling current from them), keep in mind that you are dealing with a little device with enormous energy density. This is a property that modern batteries have in common with old style explosives. Its not quite as dangerous a nitroglycerine, but certainly more dangerous than Plasticine.
If you can match the cell voltage, Ah capacity then they will share the current.
Initial difference 10mV/10mΩ is a 1A drain until equal so match as well as possible
The strongest battery i.e. the one with the lowest ESR and highest cell voltage supplies the most current.
In case of fault, there should be a Polyfuse added to each bank for safety such that a short cct prevents fire but handles a few second surge. ( Measure your motor DCR and battery V to determine peak current V/DCR
They can be charged in parallel but weakest series cells will fail first. But weak parallel cells means the strongest battery may be charged with more than it's share of current, so don't charge too fast.
Thermal sensing is wise.
Stalling motors or starting uphill inclines demands 8~10 x its rated current. So be careful about heat.