Why combine 18650 batteries?

In this project I will show you how to combine common 18650 Li-Ion batteries in order to create a battery pack that features a higher voltage, a bigger capacity and most importantly useful safety measures. These can prevent an overcharge, overdischarge and even a short circuit of the batteries.

How do you put a battery pack together?

The black wires get soldered together, and then soldered to the negative on the end of the battery pack. At this point the battery pack is almost finished, it just needs some insulation to prevent short circuits. I used two narrow strips of gaffa tape to hold the batteries together.

How to make a 2 cell battery pack from 18650 batteries?

Battery connector (I didn't have to buy this, but is only a couple of dollars if you need one) Step 1: A Bit of Theory First... In order to make a 2 (or more) cell battery pack from 18650 batteries it is necessary to connect them in series with each other, so that their voltages add up.

How do I fix a faulty battery pack?

To fix this problem we need to attach what is called a balance cable to the battery pack. A balance cable simply has a connection running to the positive end, the negative end, and each join between cells in the pack.

Is this a two-part Guide to building a lithium-ion battery pack?

Fortunately [Adam Bender] is on hand with an extremely comprehensive two-part guide to designing and building lithium-ion battery packs from cylindrical 18650 cells. In one sense we think the two-parter is in the wrong order.

What is a good replacement for a 12V lead acid battery?

A 4S pack of LFP is the most common replacement for a 12V Lead-Acid battery pack (4P X 3.2V = 12.8V nominal). That being said, NCA/NCM in the 18650-format cells have a much better selection of choices, and provide high power and long range in a small package that is affordable, due to mass-production.