1. Introduction

Advertisers are always touting more powerful and longer lasting batteries, but which batteries really do last longer in cold temperature, and is battery life impacted by the speed of the current drain? Why do we care about this problem? It is that people living in the cold countries will be affected by it as they need to stock up more lead batteries as they are not affected by temperature. It also will affect  This project looks at which AA battery maintains its voltage for the longest period of time in low temperatures. The batteries were tested using 2 motors per pair of battery by measuring the battery voltage (dependent variable) at different time intervals (independent variable) for each of the battery types in each of the devices. Our hypothesis was that the  battery’s life span will be affected by temperature. The experimental results supported our hypothesis by showing that alkaline batteries are affected by cold temperature.

All portable technology requires battery. Weather it is built in rechargeable battery or removable battery, they are all batteries and we are there to test if the batteries are affected by temperature, cold temperature to be exact. About 35% of the population lives in cold environment and they will need batteries for their everyday use. We place the batteries in the fridge for 15 minutes and then place them into our circuits and tested for how much voltage they are left with after 24 h. We found out that lead-acid type of battery is affected by cold temperature. We found out the trend is that the lower the temperature, the shorter the battery life. We then know that people living in cold environment should use alkaline battery as they are not affected by temperature. The experimental results supported our hypothesis by showing that alkaline batteries are affected by cold temperature.

1.  Introduction

1.1  Background Research  
Batteries operate by storing energy in the form of chemicals and converting them into electricity when the terminals are connected to a device. Batteries are available in many different voltages and sizes. They are also available as disposable batteries or rechargeable batteries.

Batteries are constructed with a positive electrode called a cathode and a negative electrode called an anode. These two electrodes are not directly connected to each other but placed in a medium called an electrolyte. When the terminals of the electrodes are connected to a load or device, a chemical reaction will take place in the medium whereby the anode will "supply" electrons to the cathode. These electrons travel through the electrolyte. (
HOW DOES A BATTERY WORK?. (2013). Retrieved from http://www.edinformatics.com/math_science/how_does_a_battery_work.htm)

The performance and life of the battery is affected by temperature and humidity. Batteries produce electricity through chemical processes. When temperatures drop, the chemical reaction in the electrolyte will occur more slowly resulting in smaller currents produced. However, the battery will be able to last longer. In extremely cold conditions, the electrolyte might freeze over. Increasing the temperature will result in faster chemical reactions, but the battery will also run out of power faster.

1.2  Research Question
An investigation of the effect of low temperatures on the lifespan of batteries.

1.3  Hypothesis
The battery life of the batteries are affected by the temperature of the battery. The lower the temperature, the shorter the battery lifespan.

1.3.1  Independent variable(s)
Temperature where battery is stored for 15 minutes
1.3.2 Dependent variable
Battery lifespan

1.3.3 Constants
The type and brand of batteries, environment where experiment is held

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