Here are your batteries.
Scroll to discharge them!

These Lithium Ion Batteries must not be charged higher than 4.2V.

But that is okay, you are discharging them now.

What is their lower limit?

In a car you wouldn't go deeper than 3.3V. Deep discharging your Lithium batteries will reduce their health and lifespan.

But we are adventurous today 🤿, lets push to 3.2V!

Ok, let's go back up, there are limits for charging batteries too.

If you charge too fast, your batteries get hot, there is something called the C-Rate.

The C-Rate tells you how hard you can charge or discharge a battery relative to its capacity. Where was the top actually?

The top is at 4.2V, but let's stop here at 4.1V today.

That was easy: 3.2V to 4.1V and there is the C-rate telling you how fast you can charge.

Ok, what happens if you put your batteries in parallel?

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