Why do we connect batteries?

The video tutorial explains how batteries can be connected in series or parallel to adjust voltage and capacity. It covers the concept of milliamp-hour (mAh) ratings to estimate battery lifespan and provides a formula for calculating it. The tutorial also demonstrates how to measure battery voltage using a multimeter and how to test a battery under load conditions to determine its usability.

What happens to the voltage when batteries are connected in series?

Explain the difference in voltage and capacity when batteries are connected in parallel versus in series.

What factors can affect the actual lifespan of a battery beyond its rated milliamp hours?

How can you estimate the lifespan of a battery based on its capacity and circuit current?

Describe the process of testing a battery under load to determine its usability.